(Compound annuity?) What is the accumulated sum of each of the following streams of? payments?
a. ?$480 a year for 10 years compounded annually at 10 percent.
b. ?$112 a year for 8 years compounded annually at 7 percent.
c. ?$35 a year for 12 years compounded annually at 13 percent.
d. ?$23 a year for 4 years compounded annually at 5 percent.