Assume that a demand equation is given by x=8000-100p. Find the marginal revenue for the given production levels (values of x). (Hint: Solve the demand equation for p and use R(x) = xp.) (a) 2500 units (b) 4000 units (c) 4500 units OA. The marginal revenue at 2500 units is production levels per $1. OB. The marginal revenue at units is 2500 production levels per $1. OC. The marginal revenue at 2500 units is $ per production level. units is $2500 per production level. OD. The marginal revenue at (b) Choose and fill in the correct response for x = 4000. OA. The marginal revenue at units is $4000 per production level. B. The marginal revenue at 4000 units is $ per production level. OC. The marginal revenue at units is 4000 production levels per $1. OD. The marginal revenue at 4000 units is production levels per $1. (c) Choose and fill in the correct response for x=4500. A. The marginal revenue at 4500 units is production levels per $1. B. The marginal revenue at 4500 units is $ per production level. OC. The marginal revenue at D. The marginal revenue at units is $4500 per production level. units is 4500 production levels per $1.