Q$6\mathrm{.}1($Static$)$ Crazy Cab $[6\mathrm{.}2,6\mathrm{.}3,6\mathrm{.}4]$

Crazy Cab is a small taxi cab company operating in a large metropolitan area. The company operates $20$ cabs. Each cab is worth about $$20$k$.$ The metropolitan area also requires that each cab carry a medallion $($a type of license$).$ Medallions are currently traded at $$50$k$.$ Cab drivers make $$8$ per hour and are available at every time of the day. The average cab is used for $40$ trips per day. The average trip is three miles in length. Passengers have to pay $$2$ as a fixed fee and $$2$ per mile they are transported. Fuel and other costs, such as maintenance, are $$0\mathrm{.}20$ per mile. The cab drives about $40$ percent of the distance without a paying passenger in it $($e$.$g$.,$ returning from a dropoff location, picking up a passenger, etc.$)$

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a$.$ Draw an ROIC tree for the cab company.