Flagstaff Company has budgeted production units of 9,400 for July and 9,600 for August. The direct materials requirement per unit is 3 ounces (oz.). The company requires to have safety stock of direct materials on hand at the end of each month to complete 20% of the units of budgeted production in the following month. There was 5,640 ounces of direct material in inventory at the start of July. The total ounces of direct materials to be purchased in July is: Skipped 0 28,200 oz. 0 28.800 oz. 0 33.960 oz. 0 28,320 oz. 0 28,080 oz