The standard cost of chemical mixture ~ PQ' is as follows:40% of material P @ Rs. 400 per kg.60% of material Q @ Rs. 600 per kg.A standard loss of 10% is normally anticipated in production. The followingparticulars are available for the month of March, 2005.180 kgs of material P have been used @ Rs. 680 per kg.220 kgs of material Q have been used @ Rs. 360 per kg.The actual of production of ‘PQ' was 369 kgs.Calculate the following variance:a) Material Price Varianceb) Material Usage Variancec) Material Mix Varianced) Material Yield Variance