The following labor standards have been established for a particular product: Standard labor hours per unit of output 4.4 hours Standard labor rate $ 17.70 per hour The following data pertain to operations concerning the product for the last month: Actual hours worked 6,200 hours Actual total labor cost $ 110,360 Actual output 1,300 units Required: a. What is the labor rate variance for the month? b. What is the labor efficiency