Finding a percentage of a total amount: Real-world situations Online Quiz



Following quiz provides Multiple Choice Questions (MCQs) related to Finding a percentage of a total amount: Real-world situations. You will have to read all the given answers and click over the correct answer. If you are not sure about the answer then you can check the answer using Show Answer button. You can use Next Quiz button to check new set of questions in the quiz.

Questions and Answers
Q 1 - A fast food bill was $62. If you give a 15 percent tip, what total amount will you give?

Answer : C

Explanation

Step 1:

Bill amount = $62

Step 2:

Tip amount = 15% of $62 = 0.15 × 62 = $9.30

Step 3:

Total amount = bill amount + tip amount =

= $62 + $9.30 = $71.30

Q 2 - A computer game costs $36. This Christmas season, the game is marked 20% off. How much does the game cost after discount?

Answer : D

Explanation

Step 1:

Cost of game = $36;

Step 2:

Discount = 20% × $36 = 0.2 × $36 = $7.20

Step 3:

Cost of game after discount = $36 − $7.20 =

= $28.80

Q 3 - An older version of a mobile phone was 88 millimeters thick. The new version is about 16% thinner. How thick is the new version?

Answer : A

Explanation

Step 1:

Original thickness = 88 mm

Step 2:

Decrease in thickness = 16% of 88 mm

= 0.16 × 88

= 14.08 mm

Step 3:

New thickness = 88 – 14.08 = 73.92 mm

Q 4 - Ted made a video that was 48 minutes long, but he edited and removed 10% of it. How long was Ted’s video after he edited it?

Answer : B

Explanation

Step 1:

Duration of video = 48 minutes

Step 2:

Decrease in duration = 10% of 48 minutes

= 0.1 × 48 = 4.8 minutes

Step 3:

Duration of edited video = 48 – 4.8 = 43.2 min

Q 5 - A plant was 52 centimeters tall. It grew 20% taller after a month. What was the height of the plant after a month?

Answer : D

Explanation

Step 1:

Height of plant = 52 cm

Step 2:

Increase in height = 20% of 52 cm

= 0.2 × 52 = 10.4 cm

Step 3:

New height of plant = 52 + 10.4 = 62.4 cm

Q 6 - Shania's hair was 36 centimeters long. During summer she cut off 15% of her hair. How long was Shania’s hair after the haircut?

Answer : C

Explanation

Step 1:

Length of Shania’s hair = 36 cm

Step 2:

Length of hair cut = 15% of 36 cm

= 0.15 × 36 = 5.4 cm

Step 3:

Length after haircut = 36 – 5.4 = 30.6 cm

Q 7 - An older version of a lap top was 25 millimeters thick. The new version is about 12% thinner. How thick is the new version?

Answer : B

Explanation

Step 1:

Older thickness = 25 mm;

Step 2:

Decrease in thickness = 12% of 25 mm

= 0.12 × 25 = 3 mm

Step 3:

New thickness = 25 – 3 = 22 mm

Q 8 - A store sold lawn mowers for $75 each. The service agreement cost 21% of the price of the lawn mower. What would be the cost for a mower and service agreement?

Answer : A

Explanation

Step 1:

Cost of lawn mower = $75

Step 2:

Cost of service agreement = 21% of $75

= 0.21 × 75 = $15.75

Step 3:

Cost of mower and agreement = 75 + 15.75

= $90.75

Q 9 - An old battery lasts for 14 hours. The new battery lasts 25 percent longer. How many hours will the new battery last?

Answer : B

Explanation

Step 1:

Duration of old battery life = 14 hours

Step 2:

Increase in duration = 25% of 14 = 0.25 × 14

= 3.5 hours

Step 3:

Duration of new battery life = 14 + 3.5

= 17.5 hours

Q 10 - A store had a table that cost $69. After a few months the store took 10% off the price. How much is cost of the table now?

Answer : C

Explanation

Step 1:

Cost of table = $69

Step 2:

Mark down = 10% of $69 = 0.1 × 69 = $6.9

Step 3:

Cost of table after mark down = 69 – 6.9

= $62.1


finding_percentage_of_total_amount_realworld_situations.htm

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