What should I charge?

Work backwards from what you actually want to keep.

Salaries, tools, contractors, anything the project eats.
%
%
Cash in your pocket after tax, as a share of what the client pays.
Charge at least
₹2,49,730
Round up and quote ₹2,50,000.
Client pays ₹2,49,730
Project expense53% ₹1,32,000
Tax14% ₹35,319
You keep33% ₹82,411