wikiHow Calculating Compound Interest Practice Problems Compound interest is interest calculated on the initial principal amount as well as on the accumulated interest from previous periods. The formula for calculating compound interest is: A = P(1 + r/n)^(n*t) 1. If you invest $5,000 for 3 years at an annual interest rate of 4%, compounded annually, what's the final amount? 2. If you invest $2,000 for 5 years at an annual interest rate of 6%, compounded quarterly, what's the final amount? 3. If you invest $10,000 for 2 years at an annual interest rate of 3%, compounded monthly, what's the final amount? 4. If you invest $8,000 for 10 years at an annual interest rate of 5%, compounded annually, what's the final amount? 5. If you invest $1,000 for 8 years at an annual interest rate of 2%, compounded monthly, what's the final amount? 6. If you invest $20,000 for 4 years at an annual interest rate of 8%, compounded quarterly, what's the final amount? 7. If you invest $15,000 for 6 years at an annual interest rate of 3.5%, compounded annually, what's the final amount? 8. If you invest $12,000 for 8 years at an annual interest rate of 4%, compounded quarterly, what's the final amount? 9. If you invest $25,000 for 5 years at an annual interest rate of 6%, compounded monthly, what's the final amount? 10. If you invest $3,000 for 7 years at an annual interest rate of 2.5%, compounded annually, what's the final amount? 11. If you invest $7,000 for 12 years at an annual interest rate of 5%, compounded quarterly, what's the final amount? 12. If you invest $9,000 for 3 years at an annual interest rate of 3.5%, compounded monthly, what's the final amount? 13. If you invest $6,000 for 8 years at an annual interest rate of 4%, compounded annually, what's the final amount? 14. If you invest $1,500 for 10 years at an annual interest rate of 6%, compounded monthly, what's the final amount? 15. If you invest $18,000 for 6 years at an annual interest rate of 2%, compounded quarterly, what's the final amount? 16. If you invest $4,000 for 4 years at an annual interest rate of 4.5%, compounded annually, what's the final amount? 17. If you invest $11,000 for 9 years at an annual interest rate of 5%, compounded monthly, what's the final amount? 18. If you invest $14,000 for 5 years at an annual interest rate of 3%, compounded quarterly, what's the final amount? 19. If you invest $2,500 for 8 years at an annual interest rate of 2.5%, compounded annually, what's the final amount? 20. If you invest $16,000 for 10 years at an annual interest rate of 6%, compounded quarterly, what's the final amount? Page