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 cost (in hundreds of dollars) of making x gift baskets can be approximated by C(x) Complete parts (a) through (c) below 8x+3 x+80 (a) Find the marginal cost function and the marginal cost at x 20 and x 40. The marginal cost function is