Q. XYZ factory working for 50 hours per week employs hundred workers on a job work. The standard output is 200 units per gang hour and standard rate is Rs 1 per hour. During a week in June, five employees were paid @ Rs 1.20 per hour and ten employees were paid @ 80 paise per hour. Rest of the employees were paid @ standard hour rate. The actual number of units produced was 10,200. Determine labour cost variance