1. An improvement plan calls for turning a street into a pedestrian mall with tree plantings and other beautification features. The plan will cost $7 million, and produce the following benefits and disbenefits: Benefits Disbenefit Sales tax revenue $500,000/yr.: Increased maintenance $180,000 /yr. Property tax revenue $300,000/yr. Benefits from reduced air pollution $75,000/yr. Quality of life improvements to users $75,000 /yr. A) Compute the modified B-C ratio of this plan with MARR = 12% per year, and assuming an infinite life for the project B) Compute the conventional B-C ratio of the plan, under same conditions as in A) above C) How does the how does the conventional B-C change for a 15-year project life, and MARR = 12% per year