Charles 'n Marge sell custom-build cabinet units for motor homes. The function P(x) = 2x² + 700x - 7500 gives the profit when they build and sell a cabinet units. Find a) the profit when 90 units are sold dollars b) the average profit per unit as a function of a dollars per unit c) the rate that profit is changing when exactly 90 units are sold dollars per unit to maximize profit Bound to the nearest whole number

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