A record club has found that the marginal profit, P'(x), in cents, is given by P'(x) = -0.0007x +0.16x +44.6x for x 200, where x is the number of members currently enrolled in the club. Approximate the total profit when 120 members are enrolled by computing the sum 6 P'(x) Ax with Ax=20. i=1 The total profit when 120 members are enrolled is approximately $ (Round to the nearest cent as needed.) Marginal profit (in cents) A 12,000+ 9,600- 7,200- 4,800 2,400- 0- 0 P'(x)=-0.0007x+0.16x +44.6x IV V VI 100 Number of members 200