The revenue in dollars from the sale of x calculators is given by the equation R(x) = 6 + √540x-2x² where 0≤x≤ 270. Complete parts (a), (b), and (c) below. (a) Find the marginal-revenue function. R'(x) = (Simplify your answer.) (b) Evaluate the marginal-revenue function at x = 10, x=32, and x = 148. R'(10) $ (Round to the nearest cent as needed.) R'(32) $ (Round to the nearest cent as needed.) R'(148) $ (Round to the nearest cent as needed.) (c) Explain the significance of the answers found in (b). As the number of calculators sold increases, the per calculator sold

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