Tannwin Co. sells a new product called Accountomatic and has predicted the following sales for the first four months of the current year: Jan.1800 Feb. 2050 March.2300 April. 1750 Ending inventory for each month should be 20% 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?