Sirrr... going a bit off topic but .... LPG is not a good solution for kitchen. A brotherly advise: Get a westpoint induction cooker. will cost probably 14k and you will need specific utensils costing 8-10k. The induction system is i) safe, ii) cost effective iii) easier to cook, and iv) saves time. Just to give an example. It takes 4,5 mins to prepare tea on induction vs. 10,12 mins on an LPG cylinder.
Now towards the costing part: There are various levels you can operate the machine on. But assuming an average 1200W level, and operating it for 4 hours daily, you will end up consuming 4.5units daily and 135 units monthly. At rs50/unit electricity (after accounting for additional charges and taxes), your monthly bill would be hardly 6,750. Thats apparently the max you would be billed. If you use the machine efficiently, you can reduce the bill to even 4-5k per month.