Why does the bank's interest rate differ from the normal compound interest formula...

James

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...FV=PV(1+i)^n ? Given the following variables:

Principal: $5000
Interest Rate: 16% per annum
Length of loan: 1 year

The monthly repayments from the compound interest formula FV=PV(1+i)^n (FV = final value, PV = principal, i = interest, n = number of periods) is $483.30 per month.

However when I use the bank's calculator:

http://www.commbank.com.au/tools/pl_calculators/aspcalculator/repayments.asp

it says the loan repayment would be $453.65.

Also, when I put the monthly repayments of $483.33 in Microsoft Excel's RATE() function as follows:

=RATE(12,-G6,B6)*12

I get an interest rate of 28%

Can someone please explain how the bank differs from the standard formula and how to calculate an interest rate like a bank would?
My apologies, with the Excel formula I left it as cell references. It should read:

=RATE(12,-483.33,5000)*12
 
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