The following data relates to Kogan Ltd. Cost standards: Direct material 9 kg @ $2.50 per kg $ 22.50 Direct labour 15 hours @ $7.50 per hour $112.50 Actual results: 234000 units were produced. Direct material purchased 75,000 kg @ $2.60 $195,000 Direct material used 69 300 kg Direct labour 120,300 hours @ $7.30 $878,190 Calculate the labour efficiency variance