Exercise 6-18 Bramble Industries is a leading manufacturer of golf balls. Each golf ball requires 1 minute of direct labor time to complete. Bramble used 7,760 direct labor hours in July to produce 448,200 golf balls. Bramble's standard labor rate is $12 per direct labor hour, and the actual labor rate in July was $13.81. Calculate Bramble's direct labor efficiency variance for July. (If variance is zero, select "Not Applicable" and enter o for the amounts.) Direct labor efficiency variance $