Assume that coupon interest payments are made semiannually and that par value is $1,000 for both bonds. Required: a. Calculate the values of Bond A and Bond B. (Enter all values as positive value. Do not round intermediate calculations, Round your answers to 2 decimal places.) b. Recalculate the bonds' values if the required rate of return changes to 7.70%. (Enter all values as positive value. Do not round intermediate calculations. Round your answers to 2 decimal places.)