Wildhorse Creations purchased 8100 feet of copper tubing at a price of $2.70 per foot and used 8300 feet during the period. The standard quantity allowed for the units produced is 8400 and the standard price of the copper tubing is $2.50 per foot. What is Wildhorse Creations' direct materials quantity variance for the period?

$250 unfavorable

$250 favorable

$500 favorable

$750 favorable