A toll bridge charges 100 for passenger cars and 225 for oth

A toll bridge charges $1.00 for passenger cars and $2.25 for other vehicles. Suppose that during daytime hours, 60% of all vehicles are passenger cars. If 30 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.]

Solution

30 vehicles. 30*.7 = 21 are passenger cars 30 - 21 = 9 are other vehicles. expected toll revenue = 21*1 + 2.75*9 = 45.75 answer: $45.75