Assume that a demand equation is given by q = 5000 - 100p. Find the marginal revenue for the given production levels (values of q). (Hint: Solve the demand equation for p and use R(q) = qp.) . . . a. 1000 units The marginal revenue at 1000 units is . (Simplify your answer.) b. 2500 units The marginal revenue at 2500 units is . (Simplify your answer.) c. 5000 units The marginal revenue at 5000 units is . (Simplify your answer.)