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TB MC Qu$.05-109($Algo$)$ Marquis Company uses...

Marquis Company uses a weighted$-$average perpetual Inventory system and has the following purchases and sales:

$\backslash$table$[[$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.$)$