Oriole Creations purchased 7500 feet of copper tubing at a price of $2.90 per foot and used 7700 feet during the period. The standard quantity allowed for the units produced is 7800 and the standard price of the copper tubing is $2.70 per foot. What is Oriole Creations' direct materials quantity variance for the period? $270 unfavorable $540 favorable $810 favorable $270 favorable