Percent Changes and Calculation Errors: Grade 7 Quiz

A store had 200 shirts. After a sale, they had 150 shirts left. What was the percent decrease in the number of shirts?

• 50%

• 10%

• 30%

• 25%

Emily scored 80 out of 100 on her math test. She retook the test and scored 90 out of 100. What was the percent increase in her score?

• 5%

• 12.5%

• 15%

• 20%

A car originally priced at $20,000 is now on sale for $18,000. What is the percent decrease in the price of the car?

• 10%

• 15%

• 5%

• 20%

Tom calculated that he saved 25% on a $40 jacket, but he actually saved $10. What error did Tom make in his calculation?

• Tom incorrectly calculated the jacket's original price.

• Tom did not make an error in his calculation; he correctly saved $10, which is 25% of $40.

• Tom thought he saved 50% instead of 25%.

• Tom miscalculated the percentage saved on the jacket.

A population of a town increased from 5,000 to 6,500 in one year. What is the percent increase in the population?

• 15%

• 40%

• 25%

• 30%

Sarah bought a bike for $300 and later sold it for $240. What was the percent decrease in the price of the bike?

• 15%

• 10%

• 25%

• 20%

A student thought they had improved their test score from 70% to 85%, but they actually improved to 80%. What was the percent increase they actually achieved?

• 14.29%

• 10%

• 20%

• 5%

A factory produced 1,200 toys last month and 1,500 toys this month. What is the percent increase in toy production?

• 30%

• 20%

• 25%

• 15%

A book was originally priced at $15 but is now priced at $12. What is the percent decrease in the price of the book?

• 15%

• 10%

• 25%

• 20%

During a sale, a store advertised a 30% discount on a $50 item. If a customer paid $35, what error did they make in calculating the final price?

• The discount was incorrectly calculated as 20% instead of 30%.

• No error; the customer paid the correct final price of $35 after the 30% discount.

• The final price should have been $40 after tax.

• The customer should have paid $15 after the discount.