Gale Inc. is a local reseller office furniture. Budgeted sales of ergonomic chairs for the fourth quarter are as follow: October: 300 units November: 500 units December: 600 units At the end of September, Gale had 125 units left in inventory. Gale's internal policy requires ending inventory of 25% of current month's sales each month. (For example, if June sales are 100 units, there should be 25 units in inventory at the end of June.) Gale purchases its inventory from Knox Industries at $70.00 per unit. Based on this information, how many units will Gale need to purchase in December