Sad Campa Oil has a standard of 2 direct labor hours per dire change. The standard wage rate of each technician is $29.50 per hour.In May, Campa o performed 4.710 tire changes and paid technicians $190 200 for a total of 8.980 direct labor hours. Compute the direct labor efficiency variance. Multinio Choice 587.690 favorable 574710 unforte $747 favorabid $12.00