explantantions on #5 and #9 please

5. The analysis period is the least common multiple of lives for evaluating mutually exclusive alternatives using the annual cash flow analysis. Answer: False 9. The best alternative for a MARR of 4.0% using the incremental rate of return analysis is A) Alt. C B) Alt. A C) Alt. B D) Do nothing Answer: C Refer to: Case Study Reference: Case Study The cash flows for three mutually exclusive alternatives are given in table below. MARR - 4%. Alt. A Initial cost $15,000 Annual benefits $4,500 ROR 15% Life in years Alt. B 27,000 7,600 13% Alt.C 24,000 6,500 11%