Doby Corporation makes a product with the following standard costs: Direct materials Direct labor Standard Price or Rate Standard Quantity or Hours 2.7 ounces $7.00 per ounce 0.2 hours 0.2 hours $17.00 per hour $6.00 per hour Variable overhead In July the company produced 4,800 units using 13,450 ounces of the direct material and 970 direct labor-hours. During the month the company purchased 14,600 ounces of the direct material at a price of $7.20 per ounce. The actual direct labor rate was $16.20 per hour and the actual variable overhead rate was $5.40 per hour. The materials price variance is computed when materials are purchased. Variable overhead is applied on the basis of direct labor-hours. Label answers below as F (Favorable) or Unf (Unfavorable) in addition to showing amount. Required: 36. Compute the materials price variance. 37. Compute the labor efficiency variance. 38. Compute the labor rate variance.