Practice: Percent Applications

Part A: Tax and Tip Problems

Directions: Calculate the tax, tip, or total as indicated. Show your work.

1. A meal costs $28. If the sales tax is 7%, what is the tax amount?

Tax: $

2. You want to leave a 20% tip on a $45 dinner. How much is the tip?

Tip: $

3. A haircut costs $32. With 6% tax and a 15% tip, what's the total?

Total: $

4. The total bill including 8% tax is $54. What was the original price?

Original: $

Part B: Discount and Sale Price

Directions: Find the discount amount and/or sale price.

5. A $60 shirt is 25% off. What's the sale price?

Sale price: $

6. Sneakers originally cost $120. They're on sale for 40% off. What's the discount?

Discount: $

7. A laptop is marked down from $800 to $680. What percent off is this?

Percent off: %

8. After a 30% discount, a jacket costs $56. What was the original price?

Original: $

Part C: Percent Increase and Decrease

Directions: Calculate the percent increase or decrease. Use the formula: (New - Original) / Original x 100

9. A stock price went from $40 to $52. What is the percent increase?

Percent increase: %

10. The number of students in a club dropped from 45 to 36. What is the percent decrease?

Percent decrease: %

11. A car's value dropped from $25,000 to $20,000. Percent decrease?

12. A town grew from 12,000 to 15,600 people. Percent increase?

Part D: Simple Interest (I = P x r x t)

Directions: Calculate the simple interest and total amount. Remember: r must be a decimal!

13. You invest $1,000 at 4% annual interest for 3 years. How much interest do you earn?

I = _____ x _____ x _____ = $

Total in account after 3 years: $

14. A savings account has $2,500 at 2.5% interest for 4 years. Find the interest.

Interest: $

15. P = $500, r = 6%, t = 2 years. Find I.

I = $

16. P = $3,000, r = 3.5%, t = 5 years. Find I.

I = $

Part E: Mixed Word Problems

Directions: Solve each real-world problem. Show your work.

17. Maria bought a phone for $240. The phone is now worth $180. What is the percent decrease in value?

Answer: %

18. A store marks up items by 60% from wholesale price. If a shirt costs the store $25, what is the retail price?

Retail price: $

19. James borrowed $1,500 at 8% simple interest for 2 years. How much must he pay back in total?

Total to pay back: $

20. A restaurant bill is $75. After 7% tax and 18% tip (on the pre-tax amount), what's the total?

Total: $

Challenge: Think About It!

21. A store advertises "20% off, then an additional 10% off the sale price." Is this the same as 30% off? Prove your answer using an item that costs $100.

22. If a price increased by 25%, then decreased by 25%, is the final price equal to the original? Show why or why not using $80 as the original price.