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Mathematics 9 Online
OpenStudy (anonymous):

A bank advertises that it pays interest compounded monthly. What is the effective rate of interest?

OpenStudy (anonymous):

well how much interest do they compound?

OpenStudy (anonymous):

ohh sorry! 3 3/4 %

OpenStudy (anonymous):

What is the amount,(other details about the question)?

OpenStudy (anonymous):

the question does not give the amount

OpenStudy (anonymous):

this is the full question

OpenStudy (anonymous):

\[A = P(1+r/n)^{nt}\]

OpenStudy (anonymous):

but the problem is that there is no principal cost

OpenStudy (anonymous):

so i'm assuming you want to find the latter factor hence we at least need a time frame and a compounding schedule...

OpenStudy (anonymous):

yes i guess so

jimthompson5910 (jim_thompson5910):

Effective Interest Rate \[r=(1+\frac{i}{n})^n-1\] \[r=(1+\frac{0.0375}{12})^{12}-1\] \[r=(1+0.003125)^{12}-1\] \[r=(1.003125)^{12}-1\] \[r=1.03815129-1\] \[r=0.03815129\] Effective Interest Rate is 3.8215%

OpenStudy (anonymous):

jim:are you assuming the questions asking for an annual interest?

jimthompson5910 (jim_thompson5910):

yes I'm assuming that the given rate is an annual rate

OpenStudy (anonymous):

yes that was correct!!!!

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