6-1. (Calculating the future value of an ordinary annuity) Calculate the future value of each of the following streams of payments. a. 430 a year for 12 years compounded annually at 6 percent. b. 56 a year for 8 years compounded annually at 8 percent. e. $75 a year for 5 years compounded annually at 3 percent. d. 120 a year for 3 years compounded annually at 10 percent