Problem 5 The auto repair shop of Nguyen Motors Inc. uses standards to control the labor time and labor cost in the shop. The standard labor cost for a motor tune-up is give below: Standard hours per tune-up Standard rate 2.5 hours $9.00 The record showing the time spent in the shop last week on motor tune-up 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 the tune-ups: Labor rate variance Total labor variance $87 F $93 U Compute: 16. The actual number of labor hours spent on tune-ups during the week. 17. The actual hourly rate of pay for tune-ups during the week