The month of November has 30 days. On the first day of the month, your credit card balance is $520. On 11/5 you charge $289 for an airfare, on 11/15 you pay off $500 on your account, on 11/24 you charge $28 for gas, and on 11/28 you charge $73 for a purchase at Amazon. Your credit card interest rate is 13.89%; use the average daily balance method to compute the finance charge on your December statement.