please solve

4) The capital investment in the system is $65,000, and the projected annual savings are tabled below. The system's market value at the end of year five is negligible, and the MARR is 18% per year. (30 points) End of Year Savings $25,000 2 30,000 3 30,000 4 40,000 5 46,000 a) What is the FW of this investment? b) What is the IRR of the system? c) What is the discounted payback period for this investment