## What is compound interest simple?

Compound interest is when you earn interest on both the money you’ve saved and the interest you earn. So let’s say you invest $1,000 (your principal) and it earns 5 percent (interest rate or earnings) once a year (the compounding frequency).

## Who invented compound interest formula?

It is generally agreed that the origin of compound interest can be traced back to the Old Babylonian period (ca. 2000–1600 BCE), because we know that the Babylonians called compound interest şibāt şibtim “interest on interest” in Akkadian, and even solved mathematical problems on it.

**What is the formula of compound profit?**

The formula for compound interest is A = P(1 + r/n) (nt), where P is the principal balance, r is the interest rate, n is the number of times interest is compounded per time period and t is the number of time periods.

### How do you explain compound interest to a child?

‘Compound interest’ simply means earning interest on your savings, and also, eventually, on the interest that those savings earn. The earlier your child begins to save, the more compound interest they’ll earn. An adult example would be, say, $1,000 to save.

### Why is compound interest so great?

Compound interest causes your wealth to grow faster. It makes a sum of money grow at a faster rate than simple interest because you will earn returns on the money you invest, as well as on returns at the end of every compounding period. This means that you don’t have to put away as much money to reach your goals!

**Who said compound interest?**

Albert Einstein

Albert Einstein once described compound interest as the “eighth wonder of the world,” saying, “he who understands it, earns it; he who doesn’t, pays for it.” Compound interest is when the interest one earns on a principal balance is reinvested and generates additional interest.

## Where is compound interest used in real life?

Student loans, mortgages and other personal loans. Compound interest works against you when you borrow. When you borrow money, you accrue interest on any money you don’t pay back. If you don’t pay the interest charges within the period stated in your loan, they’re “capitalized,” or added to your initial loan balance.

## How do you find APY?

APY is calculated using this formula: APY= (1 + r/n )n – 1, where “r” is the stated annual interest rate and “n” is the number of compounding periods each year. APY is also sometimes called the effective annual rate, or EAR.