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

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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?