There are no standard charges for content writing or development. It varies depending upon your experience and the kind of work and assignments you are involved in.
A rough estimate could be from INR 500 to 1500 per hour. In case it is assignment based then you can estimate the approximate number of hours and accordingly quote the charges to your client.
Hope this helps. Feel free to write to me for more information.
28th November 2016 From India, Delhi