How can i get currency exchange rate in my template?

[AlexAkhremenko]

Sorry for my English.

First currency - r. (main)
Second - $

I want to display two prices in two currencys like this:

820.000 r. (100$)

I don't know, how to do this. I just want to multiply currency exchange rate and first price to get second price.
How can i get currency exchange rate in my template?