11. the auto repair shop of quality motor company uses standard to control the labour time and cost in the shop. the standard labor cost for a motor tune-up is given below: job standard standard standard hours rate cost motor tune-up 2.5 $9 $ 22.50 the record showing the time spent in the shop last week on motor tune-ups has been misplaced. however, the shop supervisor recalls that 50 tune-ups were completed during the week, and the controller recalls the following variance data relating to tune-ups: labour rate variance. $ 87f total labour variance.. 93u required 1. determine the number of actual labour-hours spent on tune-ups during the week. 2. determine the actual hourly rate of pay for tune-ups last week.