Solve $11\mathrm{.}3($with numbers and step by step$).$The number in parentheses that follows each problem refers to the section from which the problem is taken.

$11-1.$ The Metropolitan Transit Authority $($MTA$)$ has just opened a new subway line $($the Orange Line$)$ in its underground transportation network. The Orange Line had a capital investment of $$28$ million, expected operating and maintenance expenses are $$4\mathrm{.}2$ million per year, and the final salvage value at the end of a $50-$year life is negligible. If the revenue generated by each customer is $$5,$ how many customers per day will be required before the Orange Line can break even? The MTA's hurdle $($interest$)$ rate is $6\%$ compounded annually. Assume there are $365$ days in a year. $(11\mathrm{.}2)$

$11-2.$ Refer to Example $11-2.$ Assuming gasoline costs $$4\mathrm{.}50$ per gallon, the breakeven mileage per year between the hybrid vehicle and the gas$-$only vehicle. All other factors remain the same.

$11-3.$ The Universal Postal Service is considering the possibility of fixing wind deflectors on the tops of $500$ of their long$-$haul tractors. Three types of

deflectors, with the following characteristics, are being considered $($MARR $=10\%$ per year$)$:

$\backslash$table$[[,,,],[,$Windshear,Blowby,Air$-$vantage$],[$Capital investment,$$1,200,$$$500,$$$1,500$