28 Marquis Company uses a weighted-average perpetual inventory system and has the following purchases and sales: Date August 2 August 18 00:39:11 August 29 Activities Purchase Purchase Sales Units Acquired at Cost 10 units @ $52 = $520 15 units @ $54 = $810 Units Sold at Retail 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.)