Foremost corporation manufactures boxes. the estimated number of boxes sold for the first three months of the current year are: month sales january 3,000 february 4,200 march 3,900 finished goods inventory at the end of december was 900 units. ending finished goods inventory is equal to 20 percent of the next month's sales. general corporation expects to sell the boxes for $5 each. april sales is projected at 4,500 boxes. what is the expected sales revenue for march?