The following labor standards have been established for a particular product: Standard labor-hours per unit of output Standard labor rate 9 hours $12.80 per hour The following data pertain to operations concerning the product for the last month: Actual hours worked Actual total labor cost Actual output 6,800 hours $84,320 800 units What is the labor efficiency variance for the month? Multiple Choice O $7,840 U What is the labor efficiency variance for the month? Multiple Choice $7,840 $4,960 E S7,840 E $5,120E