What is the accumulated sum of each of the following streams of payments?

a.

$480 a year for 10 years compounded annually at 11 percent.

b.

$108 a year for 7 years compounded annually at 9 percent.

c.

$37 a year for 12 years compounded annually at 11 percent.

d.

$26 a year for 5 years compounded annually at 6 percent.