Maximizing Profits: The weekly demand for DVDs manufactured by a certain media corporation is given by D(x) = 0.0004x, where D(x) denotes the quantity demanded and x denotes the unit price in dollars. The weekly total cost function associated with producing these discs is given by C(x) = 0.005x^2 + 15x + 2500, where C(x) denotes the total cost in dollars incurred for pressing discs. Find the production level that will yield maximum profit for the manufacturer. Hint: Use the quadratic formula. (Round your answer to the nearest integer) DVDs.