4. The demand for airline travel is quite sensitive to price. Typically, there is an inverse relationship between demand and price; when price decreases, demand increases and vic versa. One major airline has found that when the price (P) for a round trip between Chicago and Los Angeles is $600, the demand (D) is 500 passengers per day. When the price is reduced to $400, demand is 1,200 passengers per day. a. Plot these points on a coordinate system and develop a function that relates demand to price. b. Develop a model that will determine the total revenue as a function of the price.

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