Maximum Demand= 950.0 kVA 

Loss in switchgear=5.00 % 

Input Demand= 1000.0 kVA 

Cost of switchgear=Rs 60000

Annual charges on depreciation=Rs 7200 

Annual fixed charges due to maximum demand corresponding to triff(b)=Rs 30000 

Annual running cost due to kWh consumed=Rs 199680 

Total charges/annum for tariff(b) = Rs 236880

maximum demand corresponding to tariff(a) = 950 kVA 

Annual fixed charges=Rs 30400 

Annual running charges for kWh consumed = Rs 189696 

Total charges/annum for tariff(a) = Rs 220096 

Therefore, tariff(a) is economical