Consider the following revenue function, where R is measured in dollars. R = 49x - 1.5x2 dR Find the marginal revenue, dx dR = -3x + 49 dx Use differentials to approximate the change in revenue corresponding to an increase in sales of one unit when x = 15. (Round your answer in dollars to the nearest cent.) $ Find the actual change in revenue corresponding to an increase in sales of one unit when x = 15. (Round your answer in dollars to the nearest cent.)

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