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The formula to calculate compound interest is the principal amount multiplied by 1, plus the interest rate in percentage terms, raised to the total number of compound periods.

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To calculate effective interest rate, start by finding the stated interest rate and the number of compounding periods for the loan, which should have been provided by the lender. Then, plug this information into the formula r = (1 + i/n)^n – 1, where i is the stated interest rate, n is the number of compounding periods, and r is the effective.

One day I was looking at my credit card monthly interest charges.Then I figured I should try calculating how much I would end up saving by transferring my balance from one credit card to another credit card with a different APR (Annual Percentage Rate) and taking into consideration the transfer fees I would have to pay. I needed to figure out whether it would be worthwhile for me to go through.

The Effective Annual Rate (EAR) is the interest rate that is adjusted for compounding over a given period. Simply put, the effective annual interest rate is the rate of interest that an investor can earn (or pay) in a year after taking into consideration compounding.

Real Rate of Return or Interest. The real rate takes inflation into account, and it’s easy to calculate: Real Rate = Nominal Rate – Inflation Rate So if your CD is earning 1.5% and inflation is running at 2.0%, your real rate of return looks like this: Real Rate = 1.5% – 2.0% = -0.5% That’s right. Your real rate of return is actually negative.

Now you can calculate the real interest rate. The relationship between the inflation rate and the nominal and real interest rates is given by the expression (1+r)=(1+n)/(1+i), but you can use the much simpler Fisher Equation for lower levels of inflation.

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Interest Credits. If you receive a certain amount of interest at the end of the year for a given investment, you may determine its equivalent interest rate by using the formula: i = Int / C, where Int is the amount of interest received and C is the capital amount of your investment.