Suppose we plant x trees. Then the profit is P = (100 - .04x) (1300 + x) = 130000 - 52x + 100x - .04x^2 = 130000 + 48x - .04x^2 dP/dx = 48 - .08x = 0 ==> x = 4800/8 = 600 trees (Answer) Max profit = (100 - 24) (1900) = $144,400 (Answer)

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