A record club has found that the marginal profit, P'(x), in cents, is given by P'(x) = -0.0005x +0.26x +59.7x for x 500, where x is the number of members currently enrolled in the club. Approximate the total profit when 300 members are enrolled by computing the 6 sum P' (x) Ax with Ax= 50. i=1 *** The total profit when 300 members are enrolled is approximately $ (Round to the nearest cent as needed.) Marginal profit (in cents) 36,000 28,800 21,600 14,400 [P'(x) = -0.0005x +026x +597x 7,200- 0- 0 II III IV V VI 100 200 300 Number of members 400 500