Your EAR on your credit card will be 1.4394% if the credit card company charges you 1.43 percent per month.
Formula to calculate EAR
Effective Annual Interest Rate=(1+ r/n)ⁿ −1
where:
i=Nominal interest rate
n=Number of periods
i=(1+r/n)ⁿ−1
i=(1+0.0143/12)¹²−1
i=0.014394
I=i×100=1.4394%
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