Stephens Marne Repair Is tryng to establish the standard labor cost of a typical watercooling pump repair. The following data have been collected from time and motion studies conducted over the past 6 months. Required (a) Determine the standard direct labor hours per pump repair (b) Determine the standard direct labor hourly rate. (c) Determine the standard direct labor cost per pump repair. (d) If a pump repair took 2.25 hours at the standard hourly rate, what was the direct labor quantity variance