4. What equal payment series is required to repay the following present amounts?

4. What equal payment series is required to repay the following present amounts?
a. $10,000 in 4 years at 10% interest compounded annually with 4 annual payments.
b. $5,000 in 3 years at 12% interest compounded semiannually with 6 semiannual payments.
c. $6000 in 5 years at 8% interest compounded quarterly with 20 quarterly payments.
d. $80,000 in 30 years at 9% interest compounded monthly with 360 monthly payments.

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