Since 1 US Dollar is equal to 83.09935 Indian Rupees, we could say that n United States Dollars are equal to 83.09935 times n Indian Rupees. In other words, we could use the following formula:
Indian Rupees = United States Dollars x 83.09935
For example, let's say that we want to convert 2.0 United States Dollars to Indian Rupees. Then, we just replace United States Dollars in the abovementioned formula with 2.0:
Indian Rupees = 2.0 x 83.09935
That is, 2.0 United States Dollars are equal to 166.1987 Indian Rupees.