Expense of a re-root canal treatment will depend on many factors.
The expertise of the treating dentist
The reason for re-root canal treatment (if there is any infection or periapical leaion)
Materials and equipments used
It anyways may cost ranging from 5500 rs to 10000 rs, excluding the cap. But the cap is a must after a root canal treatment, and that will cost according to the type of cap that you want (metal/pfm/zircon/bruxir/emax/lava) there are alot of options.
Next Steps
do not worry much about the cost if the treatment advised is a must.
Health Tips
talk to your dentist in case of financial crises