I need help to resolve this problem:

Compute the future value of:

a.An initial $2,000 compounded annually for 10 years at 8%

b.An initial $2,000 compounded annually for 10 years at 10%

c.An annuity of $2,000 for 10 years at 8%

d.An annuity of $2,000 for 10 years at 10%