Marginal Revenue for an Apartment ComplexLynbrook West, an apartment complex, has 100 two-bedroom units. The monthly profit (in dollars) realized from renting x apartments is represented by the following function.P(x) = -12x² + 1680x - 45000(a)What is the actual profit realized from renting the 41st unit, assuming that 40 units have already been rented?$ (b)Compute the marginal profit when x = 40 and compare your results with that obtained in part (a).