Case(i)
Total fuel cost for the load of 220MW during 6AM to 6PM = Rs. 127440
Total fuel cost for the load of 76MW during 6PM to 6AM if both the units run = Rs. 37584
Total fuel cost for the load during 24hrs if both the units run = Rs. 165024

Case(ii)
Total fuel cost for the 24hrs laod if only unit 2 run during light loads is = Rs. 165064