Unicorn Corporation manufactures boxes. The estimated numbers of boxes sold for the first three months of the current year are as follows: Month Sales January 3,200 February 5,000 4,600 March Finished goods inventory at the end of December was 800 units. Ending finished goods inventory is equal to 25% of the next month's sales. Unicorn Corporation expects to sell the boxes for $5 each. April sales are projected at 4,500 boxes. How many boxes should be produced in February? a. 4,260 boxes b. 3,900 boxes c. 4,900 boxes d. 4,200 boxes