How can I get the exchange rate data in C4C?

Hi expert,

I am developing an enhancement for a client, when the user creates a new sales quote, the currency could be CNY, HKD or USD. I need to convert the quotation to USD based on the EXCHANGE RATE FOR FORREIGN CURRENCIES in C4C system.

Please give me advice how I can get the data/value from that EXCHANGE RATE FOR FORREIGN CURRENCIES (BO)?

Thanks a lot.