The following labour standards have been established for a particular product: Standard labour hours per unit of output 8.3 hours Standard labour rate $12.10 per hour The following data pertain to operations concerning the product for the last month: Actual hours worked 6, 100 hours Actual total labour cost $71, 370 Actual output 900 units What was the labour efficiency variance for the month?What was the labour efficiency variance for the month? Multiple Choice O $16,029 favourable. O $16,577 favourable. O $19,017 favourable. O $19,017 unfavourable