Percent of Change Quiz

1. The price of a shirt increased from $20 to $25. What is the percent of change?

• 75%

• 10%

• 50%

• 25%

Answer explanation

The percent of change is calculated by finding the difference between the new and old prices, dividing it by the old price, and multiplying by 100. In this case, the difference is $5 ($25 - $20), and the old price is $20. So, the percent of change is (5/20) * 100 = 25%. Therefore, the correct answer is 25%.

2. A car's value decreased from $15,000 to $12,000. What is the percent of change?

• 20%

• 15%

• 10%

• 25%

Answer explanation

The percent of change is calculated by finding the difference between the initial value ($15,000) and the final value ($12,000), which is $3,000. Then, divide this difference by the initial value and multiply by 100 to get the percentage. In this case, the percent of change is 20%. Therefore, the correct answer is 20%.

3. If a population increased from 500 to 600, what is the percent of change?

• 20%

• 25%

• 10%

• 50%

Answer explanation

The percent of change is calculated by taking the difference between the final and initial values, dividing it by the initial value, and multiplying by 100. In this case, the change is 100 (600 - 500), and the initial value is 500. So, the percent of change is (100/500) * 100 = 20%. Therefore, the correct answer is 20%.

4. The temperature rose from 50°F to 60°F. What is the percent of change?

• 10%

• 20%

• 30%

• 50%

Answer explanation

The temperature increased by 10°F, which is a 20% change from the original temperature of 50°F to the final temperature of 60°F. Therefore, the correct answer is 20%.

5. A student's test score increased from 75% to 90%. What is the percent of change?

• 20%

• 15%

• 25%

• 10%

Answer explanation

The percent of change is calculated by subtracting the initial score from the final score, dividing the result by the initial score, and multiplying by 100. In this case, the change is 15% (90% - 75%), not 20%. Therefore, the correct answer is 15%.

6. The length of a piece of rope increased from 10 meters to 15 meters. What is the percent of change?

• 100%

• 25%

• 75%

• 50%

Answer explanation

The length of the rope increased by 50%, as it went from 10 meters to 15 meters.

7. If a stock price decreased from $80 to $60, what is the percent of change?

• -25%

• 50%

• 20%

• 10%

Answer explanation

The percent of change is calculated by finding the difference between the initial and final values, dividing it by the initial value, and multiplying by 100. In this case, the difference is $20 and the initial value is $80, so the percent of change is -25%. This is the correct choice.

8. The number of students in a class increased from 25 to 30. What is the percent of change?

• 15%

• 10%

• 20%

• 50%

Answer explanation

The percent of change is calculated by finding the difference between the new and old values, dividing it by the old value, and multiplying by 100. In this case, the change is 5 (30-25), and the old value is 25. So the percent of change is (5/25) * 100 = 20%. Therefore, the correct answer is 20%.

9. The weight of a fruit increased from 100 grams to 120 grams. What is the percent of change?

• 50%

• 20%

• 10%

• 5%

Answer explanation

The weight of the fruit increased by 20 grams, which is a 20% change from the original weight of 100 grams. Therefore, the correct answer is 20%.

10. A recipe called for 2 cups of flour, but the baker used 3 cups. What is the percent of change in the amount of flour used?

• 75%

• 100%

• 25%

• 50%

Answer explanation

The baker used 3 cups of flour instead of 2 cups, resulting in a 50% increase in the amount of flour used.