14221.32 is required to make minimum monthly payments when 17.5 interest rate .
What Is an Interest Rate?
From this question, her card charges 17.5% compounded monthly it.
she wants a full year before paying the full balance.
she should pay = 2400 * ( 1 + 17.5%)¹²
= 2400 * ( 117.5%)¹²
= 16221.32
so the interest is = 16221.32 * 2400
= 14221.32
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