The revenue generated from a 80 unit apartment building can be modeled with the polynomial R = − 25 x 2 450 x 31000 R = - 25 x 2 450 x 31000 where x is the number of apartments rented at one time. The monthly cost to maintain the apartments is C = 200 x 1960 C = 200 x 1960 , again x is equal to the number of apartments rented. Find the profit polynomial that describes the total profit generated by the apartment complex based on the number of apartments rented.