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(a) Given the daily cost function is C(x) = x3 - 6x2 + 13x + 15 and the daily revenue function is R(x) = 28x

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(a) Given the daily cost function is C(x) = x3 - 6x2 + 13x + 15 and the daily revenue function is R(x) = 28x where x is the number of item. (i) By using the marginal cost and marginal revenue, find the number of item that will maximize the profit and the maximum profit. (5 marks) (ii) Compare the approximate profit and exact profit of increasing from 1 unit to 2 units

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