This is entirely at your discretion. However, the following may be helpful. If service is not included in the bill, 10% is usually the accepted amount. Hotel and railway porters will expect about 50 rupees for one piece of luggage and about 200 rupees for a trolley full. At the end of your stay if you wish to tip your sightseeing guide and driver, an acceptable amount for the guide would be 300-500 rupees per day and the driver 500 rupees per day.