A toll bridge charges $1.00 for passenger cars and $2.50 for other vehicles.

A toll bridge charges $1.00 for passenger cars and $2.50 for other vehicles. Suppose that during daytime hours, 60% of all vehicles are passenger cars. If 25 vehicles cross the bridge during a particular daytime period, what is the resulting expected toll revenue? [Hint: Let of passenger cars; then the toll revenue h(X) is a linear function of X.]