1. (50 points) 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. (Draw cash flow diagrams for incremental analyses) Alternatives EOY A B C Capital investment 0 $85,600 $63,200 $71,800 Annual expenses 1-7 $7,400 $12,100 $10,050