What is the present worth of each of the following given series of payments?
(a) $9,000 at the end of each year for eight years at 6% compounded annually.
(b) $1,500 at the end of each year for 10 years at 9% compounded annually.
(c) $7,500 at the end of each year for six years at 7.25% compounded annually.
(d) $5,000 at the end of each year for 30 years at 8.75% compounded annually.