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A toll bridge charges $1.00 for passenger cars and $2.25 for other vehicles. suppose that during daytime hours, 70% 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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sqdancefan
We're not quite sure what the point of the hint is, since we're interested in total revenue, not just that from passenger cars.

For 20 vehicles, we expect to see 0.70×20 = 14 passenger cars and 6 other vehicles. Then the revenue will be
  14×$1.00 + 6×$2.25 = $14.00 + 13.50 = $27.50

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