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Is the amount you're paying a % of the total or a set amount which is 4.17% of the total now?
If it's an ongoing 4.17% you'll be paying a diminishing amount each month rather than paying it off as calculated.
Also, be aware that most credit cards require a minimum payment which is usually 5% of the outstanding balance each month. Your 4.17% would mean you receive a penalty charge each month.
Just wanted to double check some maths...
After 24 months it will be paid off, correct?
24 x 4.17 = 100.08