It is really not personal finance question but I haven't found a more appropriate place for it. My question is about currency conversion. Let's imagine I have two prices for one item:
- Russian shop: 1000 roubles (Russian currency)
- American shop: 30 dollars
Now the visitor from some country comes to my site and I need to display him both prices in his currency (for example, let's imagine the user is from China and I need to convert prices to yuan currency).
How should I do it? Should I know the rates of China central bank? Or may I take the rates at central bank of any country? Does China central bank rate yuan/dollar is equal to the USA central bank dollar/yuan rate?