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At "super-long play," 2 1 2 size 12{2 { {1} over {2} } } {} hours of play of a video cassette recorder represents 31.25% of the total playing time. What is the total playing time?

8 hours

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Exercises

For the following 25 problems, find each indicated quantity.

What is 21% of 104?

21.84

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What is 98% of 545?

534.1

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What is 10 1 2 size 12{"10" { {1} over {2} } } {} % of 20?

2.1

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3.25 is what percent of 88?

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22.44 is what percent of 44?

51

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0.0036 is what percent of 0.03?

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31.2 is what percent of 26?

120

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266.4 is what percent of 74?

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0.0101 is what percent of 0.0505?

20

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2.4 is 24% of what number?

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24.19 is 41% of what number?

59

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61.12 is 16% of what number?

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82.81 is 91% of what number?

91

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115.5 is 20% of what number?

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43.92 is 480% of what number?

9.15

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29.14 is what percent of 5.13?

568

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0.6156 is what percent of 5.13?

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What is 0.41% of 291.1?

1.19351

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26.136 is 121% of what number?

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1,937.5 is what percent of 775?

250

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1 is what percent of 2,000?

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0 is what percent of 59?

0

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An item of clothing is on sale for 10% off the marked price. If the marked price is $14.95, what is the sale price? (Round to two decimal places.)

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A grocery clerk, who makes $365 per month, re­ceives a 7% raise. How much is her new monthly salary?

390.55

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An item of clothing which originally sells for $55.00 is marked down to $46.75. What percent has it been marked down?

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On a 25 question exam, a student gets 21 correct. What percent is this?

84

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On a 45 question exam, a student gets 40%. How many questions did this student get correct?

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A vitamin tablet, which weighs 250 milligrams, contains 35 milligrams of vitamin C. What per­cent of the weight of this tablet is vitamin C?

14

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Five years ago a secretary made $11,200 an­nually. The secretary now makes $17,920 an­nually. By what percent has this secretary's sal­ary been increased?

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A baseball team wins 48 3 4 size 12{"48" { {3} over {4} } } {} % of all their games. If they won 78 games, how many games did they play?

160

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A typist was able to increase his speed by 120% to 42 words per minute. What was his original typ­ing speed?

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A salesperson makes a commission of 12% on the total amount of each sale. If, in one month, she makes a total of $8,520 in sales, how much has she made in commission?

$1,022.40

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A salesperson receives a salary of $850 per month plus a commission of 8 1 2 size 12{8 { {1} over {2} } } {} % of her sales. If, in a particular month, she sells $22,800 worth of merchandise, what will be her monthly earn­ings?

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A man borrows $1150.00 from a loan company. If he makes 12 equal monthly payments of $130.60, what percent of the loan is he paying in interest?

36.28%

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The distance from the sun to the earth is approx­imately 93,000,000 miles. The distance from the sun to Pluto is approximately 860.2% of the dis­tance from the sun to the Earth. Approximately, how many miles is Pluto from the sun?

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The number of people on food stamps in Maine in 1975 was 151,000. By 1980, the number had decreased to 59,200. By what percent did the number of people on food stamps decrease? (Round the result to the nearest percent.)

61

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In Nebraska, in 1960, there were 734,000 motor-vehicle registrations. By 1979, the total had in­creased by about 165.6%. About how many motor-vehicle registrations were there in Ne­braska in 1979?

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From 1973 to 1979, in the United States, there was an increase of 166.6% of Ph.D. social scien­tists to 52,000. How many were there in 1973?

19,500

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In 1950, in the United States, there were 1,894 daily newspapers. That number decreased to 1,747 by 1981. What percent did the number of daily newspapers decrease?

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A particular alloy is 27% copper. How many pounds of copper are there in 55 pounds of the alloy?

14.85

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A bottle containing a solution of hydrochloric acid (HCl) is marked 15% (meaning that 15% of the HCl solution is acid). If a bottle contains 65 milliliters of solution, how many milliliters of water does it contain?

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A bottle containing a solution of HCl is marked 45%. A test shows that 36 of the 80 milliliters contained in the bottle are hydrochloric acid. Is the bottle marked correctly? If not, how should it be remarked?

Marked correctly

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Exercises for review

( [link] ) Use the numbers 4 and 7 to illustrate the commutative property of multiplication.

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( [link] ) Convert 14 5 size 12{ { {"14"} over {5} } } {} to a mixed number.

2 4 5 size 12{2 { {4} over {5} } } {}

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( [link] ) Arrange the numbers 7 12 size 12{ { {7} over {"12"} } } {} , 5 9 size 12{ { {5} over {9} } } {} and 4 7 size 12{ { {4} over {7} } } {} in increasing order.

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( [link] ) Convert 4.006 to a mixed number.

4 3 500 size 12{4 { {3} over {"500"} } } {}

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( [link] ) Convert 7 8 size 12{ { {7} over {8} } } {} % to a fraction.

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Questions & Answers

A golfer on a fairway is 70 m away from the green, which sits below the level of the fairway by 20 m. If the golfer hits the ball at an angle of 40° with an initial speed of 20 m/s, how close to the green does she come?
Aislinn Reply
cm
tijani
what is titration
John Reply
what is physics
Siyaka Reply
A mouse of mass 200 g falls 100 m down a vertical mine shaft and lands at the bottom with a speed of 8.0 m/s. During its fall, how much work is done on the mouse by air resistance
Jude Reply
Can you compute that for me. Ty
Jude
what is the dimension formula of energy?
David Reply
what is viscosity?
David
what is inorganic
emma Reply
what is chemistry
Youesf Reply
what is inorganic
emma
Chemistry is a branch of science that deals with the study of matter,it composition,it structure and the changes it undergoes
Adjei
please, I'm a physics student and I need help in physics
Adjanou
chemistry could also be understood like the sexual attraction/repulsion of the male and female elements. the reaction varies depending on the energy differences of each given gender. + masculine -female.
Pedro
A ball is thrown straight up.it passes a 2.0m high window 7.50 m off the ground on it path up and takes 1.30 s to go past the window.what was the ball initial velocity
Krampah Reply
2. A sled plus passenger with total mass 50 kg is pulled 20 m across the snow (0.20) at constant velocity by a force directed 25° above the horizontal. Calculate (a) the work of the applied force, (b) the work of friction, and (c) the total work.
Sahid Reply
you have been hired as an espert witness in a court case involving an automobile accident. the accident involved car A of mass 1500kg which crashed into stationary car B of mass 1100kg. the driver of car A applied his brakes 15 m before he skidded and crashed into car B. after the collision, car A s
Samuel Reply
can someone explain to me, an ignorant high school student, why the trend of the graph doesn't follow the fact that the higher frequency a sound wave is, the more power it is, hence, making me think the phons output would follow this general trend?
Joseph Reply
Nevermind i just realied that the graph is the phons output for a person with normal hearing and not just the phons output of the sound waves power, I should read the entire thing next time
Joseph
Follow up question, does anyone know where I can find a graph that accuretly depicts the actual relative "power" output of sound over its frequency instead of just humans hearing
Joseph
"Generation of electrical energy from sound energy | IEEE Conference Publication | IEEE Xplore" ***ieeexplore.ieee.org/document/7150687?reload=true
Ryan
what's motion
Maurice Reply
what are the types of wave
Maurice
answer
Magreth
progressive wave
Magreth
hello friend how are you
Muhammad Reply
fine, how about you?
Mohammed
hi
Mujahid
A string is 3.00 m long with a mass of 5.00 g. The string is held taut with a tension of 500.00 N applied to the string. A pulse is sent down the string. How long does it take the pulse to travel the 3.00 m of the string?
yasuo Reply
Who can show me the full solution in this problem?
Reofrir Reply
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Source:  OpenStax, Fundamentals of mathematics. OpenStax CNX. Aug 18, 2010 Download for free at http://cnx.org/content/col10615/1.4
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