Ira S. answered 08/07/15
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This is the same as your walnut problem.....a parabola.
x is dollars decreased...and 60x is the increase in passengers
So the price is 90-x and the number of passengers is 7000+60x.
This is where this problem ends, but the total revenue could have been maximized in the same way as the walnuts were maximized.
Hope this helped.