Efficiency of the transformer at full load and unity power factor(in %)=   
 
    97.200622  
 
 Efficiency of the transformer at full load and 0.8 lagging power factor(in %)=   
 
    96.525097  
 
 At 0.8 leading power factor. since there is no change in input and output, so efficiency is unchanged(in %)=   
 
    96.525097  