/li> 5 shares 11 comments Almost half of people who own a credit card are running the risk of being shocked at their bills as they do not know what interest rate they are on, a new study has claimed. The Moneywise Consumer Opinion Survey of 20,000 people found that 46.5 per cent of credit card holders had no idea of the rate on their card. Given that interest rates vary from the advertised rate, with the best rates generally given to those with the best credit records, being unaware of the rate can mean unknown added costs for those who do not pay off their bills on time. Unaware: Half of us don't know what interest rates there are on our credit cards. Credit cards typically carry interest rates of around 18.9 per cent Representative APR, and providers have to give the best advertised rate to 51 per cent of successful applicants under EU law. More... Why were we charged £16.69 interest on our credit card bill when our balance was just £100? The gender