To calculate the total Indian rupees that RIA will need to exchange for 1 US dollar, take the exchange rate from rupee to dollar which is equivalent to 0.015. This rateĀ is equivalent to the ratio, 1 Indian rupee (INR): 0.015 US dollars (USD). Multiplying 1 USD with the ratio of 1 INR/0.015 USD is equivalent to 66.67 INR.