TB MC Qu$.06-09$ 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 @ $$52=$$$520,],[$August $18,$Purchase,$15$ units @ $$54=$$$810,12$ units sold$],[$August $29,$Sales,,$]]$

What is the amount of the cost of goods sold for this sale? $($Round average cost per unit to $2$ decimal places.$)$

Multiple Choice

$$638\mathrm{.}40$