3. Consider the following table, Assuming n-10 and MARR-|090 Model C 90,000 32,000 94,000 25,000 Model A 58,000 Option First cost M&O, $ per year 55,000 Benefits per year 130,000 Disbenefits per year Model B 107,000 64,000 150,000 31,000 36,000 a) Calculate the equivalent cost for each alternative b) Calculate the B/C ratio for each alternative c) Based in BC ratio compare all alternatives against DN d) Using B/C Ratio analysis compare alternatives that are better than the DN alternative