Question 1

What is compound interest?

Accepted Answer

Compound interest is interest calculated on both the original principal and the interest already earned in previous periods — so your money grows faster over time than with simple interest, which is only ever calculated on the original principal.

Question 2

How does compounding frequency affect the result?

Accepted Answer

More frequent compounding (monthly vs annually, for example) means interest starts earning its own interest sooner, so the final amount is slightly higher for the same stated annual rate. The difference grows with longer time periods and higher interest rates.

Question 3

What is the formula used?

Accepted Answer

A = P × (1 + r/n)^(n×t), where P is the principal, r is the annual interest rate, n is the number of times interest compounds per year, and t is the time in years.

Question 4

Where is compound interest used in real life?

Accepted Answer

Compound interest applies to most fixed deposits, recurring deposits, PPF, and mutual fund growth — it is also why starting to invest early matters so much, since more compounding periods produce disproportionately larger growth over long horizons.

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