60 Suppose the demand function for x thousand of a certain item is p = 140 + , where x>1 and p is in dollars. In x (a) Find the marginal revenue. (b) Find the revenue from the next thousand items at a demand of 5000 (x = 5). (a) The marginal revenue function is R'(x) = (Use integers or fractions for any numbers in the expression.)

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