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 4x + 1 total cost (in hundreds of dollars) of making x gift baskets can be approximated by C(x) = x + 40 . Complete parts (a) through (c) below. (a) Find the marginal cost function and the marginal cost at x = 30 and x = 60. The marginal cost function is The marginal cost at x = 30 is $ /basket. (Round to the nearest cent as needed.) The marginal cost at x = 60 is $ /basket. (Round to the nearest cent as needed.)