Noel Enterprises has budgeted sales in units for the next five months as follows:

Jan. 6,8000 units

Feb. 5,400 units

March 7,200 units

April 4,600 units

May 3,800 units

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 December 31 contained 400 units. The company needs to prepare a production budget for the second quarter of the year.

What is the desired ending inventory in units for March?