Marquis Company uses a weighted-average perpetual inventory system and has the following purchases and sales: Date Activities Units Acquired at Cost Units Sold at Retail August 2 Purchase 10 units @ $28 = $280 August 18 Purchase 15 units @ $30 = $450 August 29 Sales 12 units sold What is the amount of the cost of goods sold for this sale? (Round average cost per unit to 2 decimal places.)