Rayyan uses a standard cost system for the processing of its credit applications. The labor standard at rayyan is 10 applications per 8 hour day at a standard cost of $15 per hour. During the last pay period, Rayyan worked 1,920 hours and processed 2,500 applications. The total labor cost for the agents during this period was $29,184. What was rayyan's labor efficiency variance for this last pay period?