Roberts Enterprises has budgeted sales in units for the next five months as follows: July June 4,500 units 7,100 units August 5,300 units September 6,700 units October 3,700units Past experience has shown that the ending inventory for each month must be equal to 10% of the next month's sales in units. The inventory on May 31 contained 450 units. The company needs to prepare a production budget for the second quarter of the year. The desired ending inventory for August is