[Quiz] Questions based on percentage increase and decrease in value (set 1)

Welcome to Math Quiz number 38. These are grade (class) 5/6 questions based on calculating the final value if the valuation increases or decreases by certain percentages. These questions check students’ understanding of percentage and decimal multiplication. Please do not use a calculator or online tool to answer these questions. Once you submit the quiz, you may see NA at the end of the questions. NA suggests that there is no hint given for that particular question. Please comment if you find the wrong answers. Have fun!!!

1. 
The price of a laptop is increasing by 10% every year. If the current price is \$1,000, what will its price be after 3 years?

2. 
A notebook costs \$50, and its price decreases by 15% over three years. What will be the final price?

3. 
The population of ants is increasing by 20% every year. What is the minimum number of years ants will take to double their population?

4. 
A bank offers a 5% annual interest rate on the savings account. If you deposit \$10,000, in how many years your balance will become more than \$20,000?

5. 
A car's value depreciates by 12% each year. If the car was originally worth \$30,000, what will be its value after 5 years?

6. 
A cell phone's price increases by 20% in the first year, then decreases by 10% in the second year, and increases by 5% in the third year. If the initial price is \$2,000, what will be the final price after 3 years?

7. 
A savings account starts with a value of \$250,000 and grows by 10% in the first year, 8% in the second year, and 12% in the third year. What will be the account's value after 3 years?

8. 
If a TV's price increases by 10% annually, and the initial price is \$700, what will it cost after 4 years?

9. 
A car's value is depreciating by 15% every year. How long will it take for the car's value to drop to one-third of its initial value?

10. 
The number of certain bacteria is increasing by 50% every hour. How many minimum hours will it take for the bacteria population to become more than 5 times its original population?

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