Capital rationing decision for a service company involving four proposals Required: 1. Compute the cash payback period for each of the four proposals. answers to one decimal place. 4. For the proposals accepted for further analysis in part (3), compute the net present value. Use a rate of 15% and the present value of $1 table above. Round to the nearest dollar. 5. Compute the present value index for each of the proposals in part (4). If required, round your answers to two decimal places. Select proposal to compute Present value index. Present value index (rounded)