The Student Government Association is making Mother's Day gift baskets to sell at a fund-raiser. If the SGA makes a larger quantity of baskets, it can purchase materials in bulk. The total c hundreds of dollars) of making x gift baskets can be approximated by C(x)= Complete parts (a) through (c) below. 9x+8 x+90 The marginal cost function is (x+90) The marginal cost at x=10 is $0.08 /basket. (Round to the nearest cent as needed.) The marginal cost at x = 20 is $ 0.07/basket. (Round to the nearest cent as needed.) (b) Find the average-cost function and the average cost at x=10 and x = 20. 9x+8 The average-cost function is +90x The average cost at x=10 is $0.10/basket. (Round to the nearest cent as needed.) The average cost at x=20 is $0.09/basket (Round to the nearest cent as needed.) (c) Find the marginal average-cost function and the marginal average cost at x=10 and x=20. The marginal average-cost function is The marginal average cost at x= 10 is $(basket). (Round to the nearest cent as needed.) The marginal average cost at x=20 is $(basket)?