Producers' Surplus The manufacturer of a brand of mattresses will make X hundred units available in the market when the unit price is p = 50 + 90e0'06" dollars. (a) Find the number of mattresses the manufacturer will make available in the market place if the unit price is set at $200/mattress. (Round your answer to the nearest integer.) mattresses (b) Use the result of part (a) to find the producers' surplus if the unit price is set at $200/mattress. (Round your answer to the nearest dollar.) $