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When you keep money in a bank or borrow it, interest is paid for using the money. Simple interest is the same every year: principal (P) × rate (R% per year) × time (T years) ÷ 100.
✓ You passed this lesson’s test.
PRT over 100 — “interest = principal × rate × time ÷ 100; turn it round to find P, R or T”
Use it for: Bank savings, loans, fixed deposits, and interest questions in Class 7–8 and aptitude tests.
🧮 Check your own sums with the free Simple interest calculator — it shows the working.
Check: 8% of ₹5000 = ₹400 a year, and 3 × 400 = ₹1200 ✓
▶ Watch it animatedWork it out in your head or on paper, type the answer and press Check. Stuck? Press “Show me how”.
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20 questions. Check each answer, then go to the next one. Get 16 or more right to pass.
🏅 Sign in with Google to earn the 🏦 Interest Investigator badge when you pass — and a certificate when you finish all 10 lessons of Part 2 · Everyday maths. You can still take the test without signing in.
Why does it work? When should you use it? Ask in English, मराठी or हिंदी.
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