9. Suppose that a product has a revenue function given by R(x) = 2500x - 2x and a cost function given by C(x) = x

9. Suppose that a product has a revenue function given by R(x) = 2500x - 2x³ and a cost function given by C(x) = x² + 2x + 1000. Find the level of rounded to the nearest production, is for which marginal profit unit, equal to 80. A)17B) 20C) 23D) 26E) 29