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This is an accepted version of this page This is the latest accepted revision, reviewed on 18 December 2024. This article is about the financial term. For other uses, see Interest (disambiguation). Sum paid for the use of money A bank sign in Malawi listing the interest rates for deposit accounts at the institution and the base rate for lending money to its customers In finance and economics ...
The simple interest calculation is easy to apply if you know the interest rate, the starting balance and how long you want to measure interest growth. ... a little more math. The formula for ...
For example, if you take out a five-year loan for $20,000 and the interest rate on the loan is 5 percent, the simple interest formula would be $20,000 x .05 x 5 = $5,000 in interest.
So if you had 4% interest on a $100,000 mortgage loan, and your loan term was 30 years you would follow this formula: $100,000 x 30 x 0.04 = $120,000. What is the easiest way to calculate interest?
A simple fraction (as with 12/78) consists of a numerator (the top number, 12 in the example) and a denominator (the bottom number, 78 in the example). The denominator of a Rule of 78s loan is the sum of the integers between 1 and n, inclusive, where n is the number of payments.
The formula above can be used for more than calculating the doubling time. If one wants to know the tripling time, for example, replace the constant 2 in the numerator with 3. As another example, if one wants to know the number of periods it takes for the initial value to rise by 50%, replace the constant 2 with 1.5.
Converting an annual interest rate (that is to say, annual percentage yield or APY) to the monthly rate is not as simple as dividing by 12; see the formula and discussion in APR. However, if the rate is stated in terms of "APR" and not "annual interest rate", then dividing by 12 is an appropriate means of determining the monthly interest rate.
It is used in interest theory. Thus a(0)=1 and the value at time t is given by: = (). where the initial investment is (). For various interest-accumulation protocols, the accumulation function is as follows (with i denoting the interest rate and d denoting the discount rate):