Assume that the total revenue received from the sale of x items is given by, R(x) = 29 In (5x + 3), while the total cost to produce x items is C(x) = x /4. Find the approximate number of items that should be manufactured so that profit, R(x) - C(x), is a maximum. . . . Approximately |items should be manufactured to maximize the profit. (Round to the nearest integer as needed.)