The marginal revenue (in thousands of dollars) from the sale of x gadgets is given by the following function. The revenue from 125 gadgets is $57,939. MR(x)=4x(x2+26,000)32 (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 $40,000 ? (a) R(x)= (Simplily your answer. Round to the nearest integer as needed.)