Exercise 10-5 Working Backwards from Labor Variances [LO10-2] The auto repair shop of Quality Motor Company uses standards to control the labor time and labor cost in the shop. The standard labor cost for a motor tune-up is given below: Job Standard Hours Standard Rate Standard Cost 1.50 $6.20 $9.30 Motor tune-up The record showing the time spent in the shop last week on motor tune-ups has been misplaced. However, the shop supervisor recalls that 230 tune-ups were completed during the week, and the controller recalls the following variance data relating to tune-ups $816 F Labor rate variance $207 U Labor spending variance Required 1. Determine the number of actual labor-hours spent on tune-ups during the week ctual labor hours hours