Bus Econ 13.2.45 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 $60,854. MR(x) = 4x(x2 + 29,000) (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.)