How Currency Conversion Works
A currency conversion is a single multiplication: the amount in the source currency multiplied by the exchange rate for that pair. If the reference rate for USD to INR is 87.20, then 1,000 USD converts to 87,200 INR at that rate.
Rates are always quoted as a pair with a direction. The inverse rate — how much of the source currency one unit of the target currency buys — is simply one divided by the rate, which is why very large and very small numbers appear on either side of the same pair.
