1. BB Ltd. furnished the following standard cost data per unit of production : Material 10 kg. @ Rs. 10 per kg Labour 6 hours @ Rs. 5.50 per hour Variable overhead 6 hours @ Rs. 10 per hour Fixed overhead Rs. 4,50,000 per month (based on normal volume of 30,000 labour hours) The actual cost data for the month of August, 2012 are as follows: Materials used 50,000 at a cost of Rs 5,25,000 Labour expenses paid Rs 1,55,000 for 31,000 hours worked Variable overhead Rs 2,93,000 Fixed overhead Rs 4,70,000 Actual production 4,800 units Calculate : (i) Material cost variance; (ii) Labour cost variance; (iii) Variable overhead cost variance; (iv) Fixed overhead cost variance