A 10kVA transformer has a primary coil and a secondary coil with the number of turns are 200V and 50Hz. Transformer is connected to is 500 and 5000 supply. The resistance and reactance of primary winding is 0.2Ω&0.1Ω respectively. The secondary winding has resistance of 1Ω & reactance 0.5Ω The constant losses of the transformer is 50W. Determine:
(a) Total variable losses of the transformer at full load.