The following standards have been established for a raw material used to make product I92: Standard quantity of the material per unit of output 4 pounds Standard price of the material $2.25 per pound Standard hours of labor per unit of output 2 hours Standard rate of the labor per hour $8 per hour The following data pertain to a recent months operations: Actual material purchased and used 12,600 pounds Actual cost of material purchased $29,610 Actual output 3,100 units of product I92 Actual labor used 6,100 hours Actual total labor cost $47,275 Required: a. What is the materials price variance for the month? b. What is the materials quantity variance for the month? c. What is the labor rate variance for the month? d. What is the labor efficiency variance for the month?