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6 March, 09:37

A credit card had an APR of 11.91% all of last year and compounded interest daily. What was the credit card's effective interest rate last year?

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  1. 6 March, 12:28
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    A. Since the APR is 15.21%, to calculate the effective interest rate you use this

    (1+APR/n) ^n - 1, where n is the number of times interest is compounded in a year.

    In this case n = 365, so you get (1+APR/n) ^n - 1 = (1+.1521/365) ^365 - 1 =.1642 = 16.42%
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