Arrow Industries employs a standard cost system in which direct materials inventory is carried at standard cost. Arrow has established the following standards for the prime costs of one unit of product. Standard Quantity Standard Price Standard Cost Direct materials $1,80 per pound 8 pounds $14.40 $8.00 per hour 0.25 hour $ 2.00 Direct labor During May, Arrow purchased 160,000 pounds of direct material at a total cost of $304,000. The total direct labor wages for May were $37,800. Arrow manufactured 19,000 units of product during May using 142,500 pounds of direct material and 5,000 direct labor hours. The direct labor efficiency variance for May is: sa decimal point, or $ sign)