Topic Details (Notes format)

How to Calculate Simple Interest

Subject: Mathematics

Book: Maths Mastery

Simple interest is used when interest is earned only on the original principal each period, making it less aggressive than compound interest. The formula is I = P × r × t, where P is the principal (initial amount), r is the annual interest rate (as a decimal), and t is the time in years. If you deposit ₹5,000 at 10% annual simple interest for 3 years, the interest I = 5,000 × 0.10 × 3 = ₹1,500. The amount after 3 years becomes ₹6,500. Simple interest frequently applies to short-term loans or straightforward lending agreements. Learning to compute it helps you compare financial products, negotiate loan terms, and develop a clearer view of short-term interest scenarios in everyday life.

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