Assume that a demand equation is given by q = 9000 - 100p. Find the marginal revenue for the given production levels (values of G). (Hint Solve the demand equation for p and use Ria) - ) a. 2500 units The marginal revenue at 2500 units is (Simplify your answer) b. 4500 units The marginal revenue at 4500 units is (Simplity your answer.) c. 7000 units The marginal revenue at 7000 units is simplify your answer.)