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## WRKDEV100-20011 Interest Rates

Now that you have gained an understanding of how to solve problems with interest, watch the following videos to learn more about interest rates. You will get to see additional examples that can help you gain a better understanding of this new concept. Consider a bank that pays 2% interest but compounds it quarterly or four times a year. This means that every quarter, the bank will pay interest equal to one-fourth of 2%, or .5%. Take a look at the following example and make sure you click the note to the right of the problem for additional information. Use our mortgage calculator to determine how much your dream home will cost each month and which interest rate is right for you.

Banks offering accounts with interest can benefit from simple interest because they don’t have to pay out as much interest over time as accounts with compounding interest. On the consumer side, borrowing money that charges simple interest benefits you because it will cost you less than compound interest. Interest is one of the main components of the economic theories developed in Keynes’s 1936 General theory of employment, interest, and money.

## Examples of finding the interest earned with the simple interest formula

In the real world, your interest—whether you’re paying it or earning it—is usually calculated using more complex methods. Understanding simple interest is one of the most fundamental concepts for mastering your finances. It involves some simple math, but calculators can do the work for you if you prefer.

When the loan is due, instead of owing \$13,000, you end up owing \$13,310. While you may not consider \$310 a huge difference, this example is only a three-year loan; compound interest piles up and becomes oppressive with longer loan terms. For example, let’s say that a student obtains a simple interest loan to pay for one year of college tuition. Simple interest is when interest is applied only to the principle of a loan, without taking into consideration any other factors (like past interest). An example is when someone charges \$20 for borrowing \$1000 for 2 years. Using the example above, when Sarah borrows \$2,000 to buy furniture, we say that the principal is \$2,000.

## Step 2 of 3

To demonstrate the concept of compound interest, assume that the interest in the previous example is now compounded annually rather than on a simple basis. Therefore, through compounding, interest is earned or incurred not only on the principal but also on the interest left on deposit. That is, if the original principal of the note is not changed, the interest payment will remain the How to Find Simple Interest Rate: Definition, Formula & Examples same for each period. Simple interest means that the interest payment is computed on only the amount of the principal for one or more periods. Any lending institution that’s required to abide by federal law, such as a bank, must state its interest rates annually and as compound rather than simple interest. Simple interest is used only for loans and investments of less than one year.

Shorter terms often have less risk of default and exposure to inflation because the near future is easier to predict. In these circumstances, short-term interest rates are lower than longer-term interest rates (an upward sloping yield curve). Default interest is the rate of interest that a borrower must pay after material breach of a loan covenant. In the 1930s, Wicksell’s approach was refined by Bertil Ohlin and Dennis Robertson and became known as the loanable funds theory. Other notable interest rate theories of the period are those of Irving Fisher and John Maynard Keynes.

## Solved Examples of Simple Interest

This is because the balance the interest is being charged on is decreasing at a slower rate than simple interest, which is calculated based on the principal as it decreases with payments over time. Simple interest is generally applied to short-term loans, usually one year or less, that are administered by financial companies. The same applies to money invested for a similarly short period of time. It can be beneficial when comparing different loan or investment options. For example, you can use the formula to compare the total cost of borrowing between different lenders or the interest earned on other savings accounts. A simple interest formula is a valuable tool for making wise financial decisions.

• Thus, instead of using an interest rate of 12% in our example, the interest rate would be 3% each quarter.
• After 10 years of compounding, you would have earned a total of \$4,918 in interest.
• This means that interest is calculated on the beginning balance of your account on each day.
• There may also be other costs factored into a loan than just interest.

If you want to calculate simple interest over more than one year, calculate the interest earnings using the principal from the first year, multiplied by the interest rate and the total number of years. Start saving with some of our favorite savings accounts or IRA providers. NerdWallet, Inc. is an independent publisher and comparison service, not an investment advisor. Its articles, interactive tools and other content are provided to you for free, as self-help tools and for informational purposes only. NerdWallet does not and cannot guarantee the accuracy or applicability of any information in regard to your individual circumstances.