Dear Mary: We are thinking of buying a used car. Currently, interest rates on auto loans at our credit union are 9 to 10 percent. We have a credit card offer in the mail that gives us a rate of 4.99 percent until the balance is paid in full. Is there any difference in the way credit card interest is calculated compared to a standard bank loan? -- Tena L., Texas

Dear Tena: Interest on credit card balances is determined using the "average daily balance" method. Auto loans come in at ...

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