## Compound Interest Formula and Maths

**Compound Interest Formula and Maths: Compound interest is** the interest that is calculated on both amount interest and principal amount. It means interest is calculated on the addition of the original amount of principal plus the amount of interest that is already earned by the bank.

Here is the formula to calculate an amount of compound interest as prescribed here.

A = P (1 + r/n )nt

Where,

A = amount

P = Principal

r = rate of interest

n = numbers of time per year, interest is compounded

nt = time in years

When you take a **loan interest** is calculated on the principal amount of the loan. This interest is added into a principal amount to calculate the next period’s interest amount and so on. Here is one example given to understand the concept of compound interest:

Letâ€™s assume you borrow the money of **Rs. 2000** over a period of **3 years** at the interest rate **10%** per year. The amount of interest is as follows.

1st year = 2000 x 10% = Rs. 200

2nd year= 2000+200 = 2200 x 10% = Rs. 220

3rd year= 2200+220 = 2420 x 10% = Rs. 242

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