I just need part b on the first one:)

Producers' Surplus The manufacturer of a brand of mattresses will moke x hundred inits available in the market when the unit price is =50+90e0.04x dollars. (a) Find the number of mattresses the manufocturer will make avalable in the market place if the unit price is set at s15e/mattress. (Round your anawer to the neareat integen) matresses (b) Use the result of part (a) to find the producers' surplus if the unit price is set at $150/ muttress. (Round your answer to the nearest dollar.) Producers' Surplus A supplier of portable hair drvers will make x hundred units of hair dryers avalable in the market when the unit price is =259+3.8x dollars. Determine the preducers' surplus if the market price is set st $21/ unit. (Round your answer to two decimal places.) Producers' Surplus The manufacturer of a brand of mattresses will moke x hundred inits available in the market when the unit price is =50+90e0.04x dollars. (a) Find the number of mattresses the manufocturer will make avalable in the market place if the unit price is set at s15e/mattress. (Round your anawer to the neareat integen) matresses (b) Use the result of part (a) to find the producers' surplus if the unit price is set at $150/ muttress. (Round your answer to the nearest dollar.) Producers' Surplus A supplier of portable hair drvers will make x hundred units of hair dryers avalable in the market when the unit price is =259+3.8x dollars. Determine the preducers' surplus if the market price is set st $21/ unit. (Round your answer to two decimal places.)