S. V. Ltd manufactures a simple product, the standard mix of which is Material A 60% at 20 per kg Material B 40% at 10 per kg Normal Loss in production is 20% on input. Due to shortage of material A, the actual mix was changed. Actual results for March, 2011 were : Material A 105 kg at 20 per kg Material B 95 kg at 9 per kg Input 200 kg Loss 35 kg Output 165 kg Calculate (i) Material Price Variance, (ii) Material Usage Variance, (iii) Material Mix Variance and (iv) Material Yield Variance