Producers' Surplus The manufacturer of a brand of mattresses will make x hundred units available in the market when the unit price is p = 200 + 60e0-0% dollars. (@) Find the number of mattresses the manufacturer will make available in the market place if the unit price is set at $300/mattress. (Round your answer to the nearest integer.) 13 mattresses (b) Use the result of part (a) to find the producers' surplus if the unit price is set at $300/mattress. (Round your answer to the nearest dollar.) N | Help Read It Watch It