The marginal revenue (in thousands of dollars) from the sale of x gadgets is given by the following function. The revenue from 120 gadgets is $39,222. MR(x) = 4x (x² + 28,000) (a) Find the revenue function. (b) What is the revenue from selling 250 gadgets? (c) How many gadgets must be sold for a revenue of at least $45,000? (a) R(x) = (Simplify your answer. Round to the nearest integer as needed.)

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