economic load dispatch solved problem 2 : economic operation of power system numerical 

Super sir

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Sir from which textbook is this question taken. Pls tell me

Q. The price of electrical energy is Rs 60 per annum per kW of maximum demand plus 3 paise per units. Lamp 1 costs Rs. 1.50 and takes 100 W and Lamp 2 costs Rs. 4.00 and takes 30 W. Both gives the same candle power and have the same useful life of 1000 hours . 1. Out of two lamps which is more economical. 2.At what load factor both the lamps are equally economical. Please reply.

sir shortcut matt mara kro abb values kese put ki woh to batado saath mai kuch smjh mai nhi aa rha

Equation 5 and 6 how to solve I'm not understanding sir help me

Equation 1 or 2 ko solve kaise kre

F2 value is different, therefore total cost is different. I am getting F2=4958.63