6. The standard cost of a chemical mixture is as under: Consumption for 100 units of product Raw Material A - 40 units @ Rs.50 per unit Raw Material B-60 units @ Rs.40 per unit Actuals: Raw Material A50 units @ Rs.50 per unit Raw Material B-60 units@Rs.45 per unit Calculate the following with the help of given information: a) Material Cost variance b) Material Price Variance b) Material Usage Variance d) Material Mix Variance