What is the present worth of each of the given series of payments?
(a) $1,700 at the end of each six‐month period for 10 years at 9% compounded semiannually.
(b) $9,000 at the end of each quarter for five years at 8% compounded quarterly.
(c) $4,000 at the end of each month for eight years at 9% compounded monthly.