Calculate all three (see Problem 8.11) PW indexes (at i = 15%) for the following projects described in the table. What reason(s) are there to prefer one index over another? Each project is to be evaluated over 10 years. Project A B First cost(s) $30K $30K in year 0, $30K $20K in year 1 O&M/year 13K 10K 46K Revenue 20K 17K 53K Salvage 0 20K 0