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$10-3.$ A proposal has been made for improving the downtown area of a small town. The plan calls for

banning vehcular traflic on the main street and torning As strect into a pedestrian mail with tree plantings and ovars of $$6,000,000$ and, according to its proporientity, the plun will produce benefits and disbenefits to the town as follows

Bencfits

Increasod sales tax revenue

Incroased real estate property taxes $$$30,000$ per ycart Bencfis due to decreased air pollution $$80,000$ per ycar. Quality of life improvements to users $$70,000$ per year

Dibencfits:

Increased maintenance

$$175,000$ per ycar

a$.$ Compute the B C ratio of this plan based on a MARR of $10\%$ per year and an infinite life for the project. $(10\mathrm{.}7)$

How does the $B-C$ ratio change for a $20-$ycar procot life? $(10\mathrm{.}7)$