Blue Wave Company budgets the following unit sales for the next four months: September, $4,000$ units; October, $4,100$ units; November, $6,400$ units; and December, $7,700$ units. The company$$s policy is to maintain finished goods inventory equal to $70\%$ of the next month$$s unit sales. At the end of August, the company had $2,800$ finished units in inventory.

Prepare a production budget for each of the months of September, October, and November.