While showing work please help with this question:

Jackson Company had a finished goods inventory of 55,000 units on January 1. It's projected sales for the next four months were: January - 200,000 units; February - 180,000 units; March - 210,000 units; and April - 230,000 units. The Jackson Company wishes to maintain a desired ending finished goods inventory of 20% of the following months sales.