The cost (in hundreds of dollars) incurred by a flower shop to produce x hundred flower arrangements for delivery on Valentine's Day is given by C(x) = x² + 3x + 18. (a) Find the marginal cost at a production level of 200 flower arrangements. (b) Find the average cost at a production level of 200 flower arrangements. (c) Find the marginal average cost at production levels of 200 and 500 flower arrangements.

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