Consider a hypothetical cell phone company whose manufacturing costs x number of cell phones is C = 2000x + 750,000 whose profit obtained by x number of cell phones is R = -0.09x ^ 2 + 7000x. Apply the relative maximum and minimum values of a polynomial function to determine the gain function. Given the following data, determine the profit of the company when

x = 50 cell phones

x = 12,500 cell phones

x = 30,000 cell phones