(i) When power factor is unity
    MAx demand charge per unit = 5.71 paise 
    Energy charge per unit = 8 paise 
    Overall cost per unit = 13.71 paise 

(i) When power factor is unity
    MAx demand charge per unit = 8.15 paise 
    Energy charge per unit = 8 paise 
    Overall cost per unit = 16.15 paise 


