3. The four revenue alternatives described below are being evaluated. (a) If the proposals are independent, which ones should be selected at a MARR of 17% per year? Why? (b) If the proposals are mutually exclusive, which one should be selected at a MARR of 14.5% per year? Show the step-by-step process of this determination. Incremental Rate of Return, %. When Compared with Alternative Initial Overall Rate of Alternative Investment, $ Return, % -60,000 11.7 -90,000 22.2 43.3 - 140,000 17.9 22.5 10.0 -190,000 15.8 17.8 10.0 10.0