Pitt Corp. makes and sells a single product, widgets. Two pounds of sand are needed to make one widget. Budgeted production of widgets for the next two months follows: September October 25,000 units 31,000 units The company wants to maintain monthly ending inventories of sand equal to 20% of the following month's production needs. On August 31, 10.000 pounds of sand were on hand. How much sand should be purchased in September? Sand should be purchased