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    Interest calculation for credit card balance

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    Nancy Tai has recently opened a revolving charge account with MasterCard. Her credit limit is $1000, but she has not charged that much since opening the account. Nancy hasn't had the time to review her monthly statements as promptly as she should, but over the upcoming weekend, she plans to catch up on her work.

    In reviewing November's statement, she notices that her beginning balance was $600 and that she made a $200 payment on November 10. She also charged purchases of $80 on November 5, $100 on November 15, and $50 on November 30. She can't tell how much interest she paid in November because she spilled watercolor paint on that portion of the statement. She does remember, though, seeing the letters APR and the number 16%. Also, the back of her statement indicates that interest was charged using the average daily balance method including current purchases, which considers the day of a charge or credit.

    Assuming a 30-day period in November, calculate November's interest. Also, calculate the interest Nancy would have paid with: a) the previous balance method, b) the adjusted balance method.

    Going back in time, when Nancy was just about to open her account, and assuming she could choose among credit sources that offered different monthly balance determinations, and assuming further that Nancy would increase her outstanding balance over time, which credit source would you recommend?

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    Solution Preview

    Hi see the attached files for complete help.


    Account Sheet for the Month of November

    Date Transaction Transaction Amount Closing Credit Balance No of days Closing credit*no of days
    Debit Credit
    1-Nov Opening Balance $600 4.00 $2,400
    5-Nov Purchases Made $80 $680 5.00 $3,400
    10-Nov Payments made $200 $480 5.00 $2,400
    15-Nov Purchases Made $100 $580 15.00 $8,700
    30-Nov Purchases Made $50 $630 1.00 $630
    Closing Balance $630
    Total 30.00 $17,530
    Average daily ...

    Solution Summary

    The solution explains different methods of interest calculation on the credit balance for the MasterCard. The solution is presented both in word format and in Excel format so that one can see the underlying calculations and formulas. The methods discussed are previous balance method, adjusted balance method and average daily balance method.