6-14. The estimated negative cash flows for three design alternatives are shown below. The MARR is 12% per year and the study period is seven years. Which alternative is best based on the IRR method? Doing nothing is not an option. (6.4.2)

Alternative EOY A B C Capital investment 0 $85,600 $63,200 $71,800 Annual expenses 1 – 7 7,400 12,100 10,050