What is the present worth of the following series of payments?
(a) $1,000 at the end of each year for eight years at 7.2% compounded annually.
(b) $4,500 at the end of each year for 12 years at 9.5% compounded annually.
(c) $1,900 at the end of each year for 13 years at 8.25% compounded annually.
(d) $19,300 at the end of each year for eight years at 7.75% compounded annually.