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 4 percent. a. What is the bond price at 12 percent? b. What is the bond price at 4 percent? c. What would be your percentage return on investment if you bought when rates were 12 percent and sold when rates were 4 percent? (Do not round intermediate calculations. Input your answer as a percent rounded to 2 decimal places.)