R ates fluctuates on daily basis. The conversion given is a fare idea. While each state has its own regional language, Hindi and English are widely spoken. Visa is not granted on arrival at any airport in India. Through recognised money changing agents or Banks or at the hotel counters.
Money changing facilities are also available at the international airports.
Please keep certificate of changing money from foreign currency to Indian Rupees safely. You are allowed to rechange your money back in your currency on final departure at the Bank Counter at the airports.