Information on four investment proposals is given below: Investment Proposal C A $(120,000) 160,000 $(70,000) 105,000 $(90,000) $(100,000) 126,000 Investment required ... Present value of cash inflows 138,000 $ 40,000 $38,000 $35,000 $36,000 Net present value 6 years 6 years 7 years 5 years Life of the project Required: 1. Compute the project profitability index for each investment proposal. 2. Rank the proposals in terms of preference