Current Attempt in Progress Cullumber Creations purchased 7300 feet of copper tubing at a price of $2.60 per foot and used 7500 feet during the period. The standard quantity allowed for the units produced is 7600 and the standard price of the copper tubing is $2.40 per foot. What is Cullumber Creations' direct materials quantity variance for the period? O $240 favorable O $720 favorable O $480 favorable O $240 unfavorable