How to calculate the beginning inventory and how is it 2430? Please explain!

Reyes Merchandising Company has created the following sales forecast for the beginning of the upcoming fiscal year: The company expects to start the year with 1, 970 units in merchandise inventory. Management desires an ending merchandise inventory in each month equal to 15% of next month's budgeted unit sales. How many units of merchandise does Reyes expect to purchase for March? 18, 840 16, 410 16, 200 18, 155