this is the entire question

In the following problem, c represents the average cost per unit, which is a function of the number q of units produced. Find the marginal-cost function and the marginal cost for the indicated values of q. 7000 c= 0.001q2 -0.5q + 80 + - -; q=20, q=30 Determine the marginal-cost function. Select the correct choice below and fill in the answer box to complete your choice. (Use integers or decimals for any numbers in the expression.) O A. bp = 818 11 The marginal cost for q = 20 is (Type an integer or a decimal.) The marginal cost for q = 30 is (Type an integer or a decimal.)