10-30. What is the modified B–C ratio for the flood control project?

(a) 1.53

(b) 1.33

(c) 1.76

(d) 2.20

(e) 4.80 10-31. You have been tasked with recommending one of the mutually exclusive industrial sanitation control systems summarized below. The life of both alternatives is 30 years, and residual salvage values are negligible. Use the benefit–cost ratio method in your analysis. If the MARR is 8% per year, which answer below would you recommend? (10.9)