# Thread: Effective Interest Rate

1. ## Effective Interest Rate

I can't seem to get the right effective interest rate for the following question:

- Savings account with a nominal annual interest rate of 4.5%, compounded semi-annually, with interest payable monthly. Find the effective interest rate.

My process: (I'm not quite sure if I'm going the right way approaching this problem)
1. Finding the semi annually rate: EAR = [1+0.045/2]^2 - 1 = 1.04551-1 = 0.45516

2. Solving for monthly: [1 + 0.4551]^ (1/12) -1 = 0.0037 or 0.37%

I got 0.37% <---definitely wrong.

Any help/input will be greatly appreciated.

2. "nominal annual interest rate of 4.5%, compounded semi-annually"
means effective of (1 + .045/2)^2 - 1 = 1.04550625 - 1 = .04550625 or ~4.55%

The frequency that the interest is paid does not affect this.

3. Originally Posted by Wilmer
"nominal annual interest rate of 4.5%, compounded semi-annually"
means effective of (1 + .045/2)^2 - 1 = 1.04550625 - 1 = .04550625 or ~4.55%

The frequency that the interest is paid does not affect this.
If the question was nominal annual interest rate of 4.5%, compounded monthly, would the effective interest rate be 0.37% as calculated above?

Thanks.

4. Originally Posted by Mmike
If the question was nominal annual interest rate of 4.5%, compounded monthly, would the effective interest rate be 0.37% as calculated above?
Effective annual rate = (1 + .045/12)^12 - 1 = (1.00375)^12 - 1 = 1.045939825 - 1 = .045939825 or ~4.59%

### effective interest rate in busi

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