Koshikawa, a manufacturer of exercise equipment purchases the pulley section of the equipment from a supplier who lists these prices: less than 1,000, RM5 each; 1,000 to 3,999, RM4.95 ench; 4,000 to 5,999 , RM4.90 each; and 6,000 or more, RM4.85 each. Ordering costs are RM50, annual carrying costs per unit are 40 percent of purchase cost, and annual usage is 4,900 pulleys. Determine an order quantity that will minimize the total cost.