Cowles Corporation, Inc. makes and sells a single product, Product R. Three yards of Material K are needed to make one unit of Product R. Budgeted production of Product R for the next five months is as follows: August September October November December 13,000 units 13,500 units 14,500 units 13,600 units 12,900 units The company wants to maintain monthly ending inventories of Material K equal to 30% of the following month's production needs. On July 31, this requirement was not met because only 3,500 yards of Material K were on hand. The cost of Material K is $0.80 per yard. The company wants to prepare a Direct Materials Purchase Budget for the rest of the year. The desired ending inventory of Material K for September is: 13,050 yards 12,500 yards 12,150 yards 12,750 yards