Using a MARR of 15%, the PW of the investment in A when compared incrementally to C

Question:

Using a of 15%, the PW of the investment in A when compared incrementally to C is most nearly:
(a) -$69,000
(b) -$21,000
(c) $20,000
(d) $61,000
(e) $53,000
MARR
Minimum Acceptable Rate of Return (MARR), or hurdle rate is the minimum rate of return on a project a manager or company is willing to accept before starting a project, given its risk and the opportunity cost of forgoing other...