Wildhorse Creations purchased 10000 feet of copper tubing at a price of $2.40 per foot and used 9700 feet during the period. The standard quantity allowed for the units produced is 9500 and the standard price of the copper tubing is $3.40 per foot. What is Wildhorse Creations' direct materials quantity variance for the period? 0 $480 unfavorable O $1700 unfavorable 0 $1020 unfavorable O $680 unfavorable