The operating cost to an airline for having a flight between its west-coast and east-coast hubs changes with the price of oil. The average ticket price for a seat on one of these flights is t(f) = 0.4f + 10 dollars where fis the operating cost of the flight in dollars. When a barrel of oil is at $130, the operating cost to the airline is changing by $250 per dollar. At this oil price, what is the rate of change of ticket price with respect to the price of oil? $ per dollar oil price

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