If you are looking to change some foreign currency into Indian Rupees at your arrival in India, better ask your indian driver. The exchange rates at the airport are usually not in favor of travelers. You won't have any expenditure during the first hours of your arrival, and your indian driver will be happy to take you to a bank downtown for a better rate. To know the current exchange rate of Indian Rupees, check out on xe.com
During the redt if your trip in India, your indian driver will always be at your disposal in case you need to find an ATM. Your driver knows the cities you will visit very well, and will always take you to safe locations.