Sheridan Creations purchased 8800 feet of copper tubing at a price of $2.60 per foot and used 9000 feet during the period. The standard quantity allowed for the units produced is 9100 and the standard price of the copper tubing is $2.40 per foot. What is Sheridan Creations' direct materials quantity variance for the period?

$720 favorable $480 favorable $240 unfavorable $240 favorable