Answer:
$7988.
Explanation:
Total Labor Cost = $6639 + ($2.09 x Employee Hours)
Total Labor Cost for September = $6639 + ($2.09 x 645)
Total Labor Cost for September = $6639 + $1349.05
Total Labor Cost for September = $7988.05
Rounded to the nearest whole number, the total variable labor cost for September is $7988.