An agency charges $100 per person for a trip to a concert if 40 people travel in a group. But for each person above the 40, the

Question

An agency charges $100 per person for a trip to a concert if 40 people travel in a group. But for each person above the 40, the amount charged for each traveler will be reduced by $4. If x represents the number of people above the 40, write the agency's revenue R as a function of x. (Assume that x is greater than zero.)

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