(Solution) - What is the present worth of the following series of -(2025 Original AI-Free Solution)

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What is the present worth of the following series of payments?
(a) $3,000 at the end of each six-month period for 10 years at 6% compounded semiannually.
(b) $4,000 at the end of each quarter for 12 years at 8% compounded quarterly.
(c) $2,200 at the end of each month for four years at 9% compounded monthly.