Dawes Designs buys T-shirts for clubs, teams, and other organizations. Dawes takes the shirts and adds the organization's logo. Because of the uncertainty in the timing of the sales and to avoid stock outages, Dawes tries to maintain an inventory of shirts equal to two-month's of sales. The shirts cost $22.50 each and must be paid for in cash. On June 30 of the current year, the company expects to have 17,200 shirts in stock. Sales estimates, based on contracts received and historical data, are as follows for the next six months:

July 8,620

August 11,590

September 9,060

October 9,610

November 7,080

December 5,760

Required:a. & b. Estimate purchases (in units) and cash required to make purchases in July, August, and September.