7.10 Calculate (a) the conventional B/C ratio, (b) the modified B/C ratio, and (c) the PI for the following cash flow estimates at a discount rate of 10% per year. Compare the resulting values. (6 Points) Item PW of benefits, $ AW of disbenefits, S/year First cost, $ M&O costs, $/year Life of project, years Cash Flow 3,800,000 45,000 1,200,000 300,000 20