M23-19. Direct Labor Variances Advanced Micro Devices develops high-performing computing products. Assume one of its proces- sors, Ryzen 7 Pro, has a standard labor time of 0.25 hours and a standard labor rate of $20 per hour. During February, the following activities pertaining to direct labor for Ryzen 7 Pro were recorded: Direct labor hours used . . . 64,000 Direct labor cost . . . . .. . . $1,248,000 Units of Ryzen 7 Pro manufactured 250,000 Required a. Determine the labor rate variance. b. Determine the labor efficiency variance. c. Determine the total flexible budget labor cost variance