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Some accounting/economics questions: James owes $1,250 on his credit card which charges 19

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Some accounting/economics questions:

1. James owes $1,250 on his credit card which charges 19.5% interest per year, compounded monthly. This interest is typical of many credit cards. (You may want to view the material at: http://www.pbs.org/wgbh/pages/frontline/shows/credit/view/ Note that some changes in the law have occurred since this video was first broadcast.) If he pays the minimum payment of $30 per month, how long will it take to pay off the debt? Hint: use P = A(P | A i, n) and solve for n. The answer is a whole number and you must enter the exact value.
2. How much interest will James pay?
3. What is the largest monthly payment for which James will never pay off the debt?
4. What is the smallest annual interest rate (compounded monthly) for which James will never pay off the debt with a $30 per month payment?