1. The price of a laptop increased by 20% and then decreased by 10%. What is the overall percentage change?
2. A car’s value decreased by 15% in the first year and then increased by 25% in the second year. What is the overall percentage change in its value?
3. The population of a town increased by 8% in the first year and then decreased by 5% in the second year. What is the overall percentage change in the population?
4. A store initially had 500 items in stock. After a sale, the stock decreased by 30%. What is the new stock level?
5. A student scored 80% in a test and then improved their score by 15% in a retest. What is their final score?
6. The price of a book increased by 10% and then decreased by 5%. What is the overall percentage change in its price?
7. A company’s profit increased by 12% in the first quarter and then decreased by 8% in the second quarter. What is the overall percentage change in profit?
8. A phone’s battery life decreased by 20% after a software update. What is the new battery life percentage?
9. A company’s revenue increased by 5% in the first year and then decreased by 3% in the second year. What is the overall percentage change in revenue?
10. A student’s test score increased by 10% in the first term and then decreased by 15% in the second term. What is the overall percentage change in their score?
11. The price of a shirt increased by 25% and then decreased by 20%. What is the overall percentage change in its price?
12. A company’s stock price increased by 8% in the morning and then decreased by 6% in the afternoon. What is the overall percentage change in the stock price?
13. A student’s attendance increased by 5% in the first semester and then decreased by 2% in the second semester. What is the overall percentage change in attendance?
14. The price of a ticket increased by 15% and then decreased by 10%. What is the overall percentage change in the ticket price?
15. A company’s expenses increased by 10% in the first quarter and then decreased by 7% in the second quarter. What is the overall percentage change in expenses?

Answers: 1. Overall percentage change = (20% - 10%) = 10% 2. Overall percentage change = (25% - 15%) = 10% 3. Overall percentage change = (8% - 5%) = 3% 4. New stock level = 500 - (30% of 500) = 350 items 5. Final score = 80% + (15% of 80%) = 92% 6. Overall percentage change = (10% - 5%) = 5% 7. Overall percentage change = (12% - 8%) = 4% 8. New battery life percentage = 100% - 20% = 80% 9. Overall percentage change = (5% - 3%) = 2% 10. Overall percentage change = (10% - 15%) = -5% 11. Overall percentage change = (25% - 20%) = 5% 12. Overall percentage change = (8% - 6%) = 2% 13. Overall percentage change = (5% - 2%) = 3% 14. Overall percentage change = (15% - 10%) = 5% 15. Overall percentage change = (10% - 7%) = 3%