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A toll bridge charges $1.00 for passenger cars and $2.50 for other vehicles. Suppose that during daytime hours, 65% of all vehicles are passenger cars. If 20 vehicles cross the bridge during a particular daytime period, what is the resulting expected toll revenue? [Hint: Let X = the number of passenger cars; then the toll revenue h(X) is a linear function of X.]

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texaschic101
65% of all vehicles are passenger cars......20 vehicles crosses the bridge

this means that 65% of 20 are passenger cars..
0.65(20) = 13 cars are passenger cars.....leaving (20 - 13) = 7 that are other vehicles.

toll bridge charges $ 1 for passenger cars and 2.50 for other vehicles...
expected toll revenue is : 13(1) + 7(2.50) = 13 + 17.5 = $ 30.50 <==

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