The weekly demand for the Pulsar 40-in. high-definition television is given by the demand equation p = -0.05x + 586 (0 ≤ x ≤ 12,000), where p denotes the wholesale unit price in dollars and x denotes the quantity demanded. The weekly total cost function associated with manufacturing these sets is given by C(x) = 0.000004x^3 - 0.04x^2 + 400x + 80,000, where C(x) denotes the total cost incurred in producing x sets. Find the level of production that will yield a maximum profit for the manufacturer. Hint: Use the quadratic formula. (Round your answer to the nearest whole number.)