MinnOil performs oil changes and other minor maintenance services on cars and trucks. The company advertises that all services are performed within 15 minutes each. On a recent Saturday, 160 cars were serviced, resulting in the following labor variances: rate, $19 unfavorable; efficiency (time), $14 favorable. If MinnOil's standard labor rate is $7 per hour, determine the actual wage rate per hour and the actual hours worked. Wage Rate Oa. a. $6.67 Hours Worked 42.71 Ob. $7.50 38.00 Oc. $6.55 42.00 - AC