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Wiley Edge Percentages Quiz-2

Question 1

Time: 00:00:00

The population of a city increased from 500,000 to 600,000. By what percentage did the population increase?

10%

12%

15%

20%

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The increase in population is 600,000 - 500,000 = 100,000. The percentage increase is (100,000 / 500,000) * 100 = 20%.

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Question 2

Time: 00:00:00

A bookstore sells a book for $15, making a profit of 25%. What is the cost price of the book?

$10

$11

$12

$13

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The profit of 25% on the cost price is $15 - ($15 / 1.25) = $12.

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Question 3

Time: 00:00:00

The price of a laptop is increased by 20%, and then it is decreased by 15%. What is the overall percentage change in the price?

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The overall percentage change can be calculated as (20% - 15%) - (20% * 15%) = 4%.

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Question 4

Time: 00:00:00

The length of a rectangle is increased by 10%, and the width is decreased by 5%. What is the percentage change in the area of the rectangle?

4.5%

5.5%

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The percentage change in the area can be calculated as (10% - 5%) + (10% * -5%) = 4.5%.

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Question 5

Time: 00:00:00

A car depreciates by 8% each year. If its original value was $20,000, what is the value of the car after 3 years?

$15,360

$15,840

$16,320

$16,800

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The value of the car after 3 years can be calculated as $20,000 * (1 - 0.08)^3 = $15,840.

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Question 6

Time: 00:00:00

The price of a stock increased from $50 to $60. What is the percentage increase in the price?

10%

15%

20%

25%

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The increase in price is $60 - $50 = $10. The percentage increase is (10 / 50) * 100 = 20%.

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Question 7

Time: 00:00:00

A company had 500 employees, and it laid off 10% of its workforce. How many employees are left?

400

450

475

650

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The number of employees left can be calculated as 500 - (10% * 500) = 400.

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Question 8

Time: 00:00:00

The length of a rectangle is increased by 25%, and the width is increased by 10%. What is the percentage change in the perimeter of the rectangle?

33.75%

35%

37.5%

38%

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The percentage change in the perimeter can be calculated as (25% + 10%) + (25% * 10%) = 37.5%.

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Question 9

Time: 00:00:00

A discount of 40% is applied to the original price of an item, and then a further discount of 20% is applied to the discounted price. What is the overall percentage discount?

48%

52%

56%

60%

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The overall percentage discount can be calculated as 40% + 20% - (40% * 20%) = 48%.

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Question 10

Time: 00:00:00

A tank initially contains 500 liters of water. If 20% of the water is drained out, how many liters of water are left?

400

410

420

480

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The amount of water left can be calculated as 500 - (20% * 500) = 480 liters.

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