I only need help with part c!

Refer to Table 10-1, which is based on bonds paying 10 percent interest for 20 years. Assume interest rates in the market (yield to maturity) decline from 12 percent to 11 percent. a. What is the bond price at 12 percent? Bond price 850.61 b. What is the bond price at 11 percent? Bond price 920.37 c. What would be your percentage return on investment if you bought when rates were 12 percent and sold when rates were 11 percent? (Do not round intermediate calculations. Input your answer as a percent rounded to 2 decimal places.)