What equal annual payment series is required to repay the following present amounts? (a) $10,000 in 5 years at 5% interest compounded annually (b) $5,500 in 4 years at 9.7% interest compounded...

(a) $10,000 in 5 years at 5% interest compounded annually

(b) $5,500 in 4 years at 9.7% interest compounded annually

(c) $8,500 in 3 years at 2.5% interest compounded annually

(d) $30,000 in 20 years at 8.5% interest compounded annually