Tannwin Co. sells a new product called Accountomatic and has predicted the following sales for the first four months of the current year:

	Jan.	Feb.	March.	April.
Sales in units	1,900	2,200	2,500	1,900

Ending inventory for each month should be 15% of the next month's sales, and the prior December 31 inventory is consistent with that policy. How many units should be purchased in the first quarter of the year?