In your business, you often have to deal with foreign clients. When it comes to financial transaction, sometimes, it takes time to decide how much to charge as buyer and seller might require different currencies. If you want to receive a payment for your service, you would need to figure out the value of currency in your client’s country, in terms of currency of your country. For example, you need to understand the what is the rate of your service in terms of UK pounds because your client living in UK, may not be able to pay you in US dollars. If you need to pay someone, you need to know how much you need to pay that would amount to the charge for his services, in terms of currency of his country.