Q1
Not Answered
NATIVE
Q1. Find the Simple Interest on Rs. 5000 at 20% per annum for 3 years.
SI = PRT/100 = 5000 x 20 x 3/100 = 3000.
Home / General Aptitude / Simple Interest / Compound Interest
General Aptitude
Simple Interest / Compound Interest
Practice SI and CI questions with principal, rate, tenure, and comparison-focused problems.
About Simple Interest / Compound Interest
Simple Interest (SI) and Compound Interest (CI) are essential topics for banking, SSC, and placement exams. Simple interest is calculated only on the original principal using the formula SI = (P × R × T) ÷ 100, where P is principal, R is the annual rate, and T is time in years. Compound interest, however, is calculated on the principal plus accumulated interest — the amount grows exponentially as A = P(1 + R/100)^T, and CI = A - P. For two years, there is a useful shortcut: CI - SI = P × (R/100)². The questions below demonstrate both concepts with varied difficulty levels.
Key Takeaways
- SI grows linearly: same interest each year. CI grows exponentially: interest on interest.
- For 2 years: CI - SI = P × (R/100)². This is a time-saving shortcut.
- For half-yearly compounding, halve the rate and double the periods.
Frequently Asked Questions
What is the difference between SI and CI?
Simple Interest (SI) is calculated only on the principal: SI = (P × R × T) ÷ 100. Compound Interest (CI) is calculated on principal + accumulated interest: Amount = P(1 + R/100)^T. Over 2 years, CI exceeds SI by P × (R/100)².
When should I use the compound interest formula?
Use CI when interest is added back to the principal each period. For annual compounding: A = P(1 + R/100)^n. For half-yearly compounding: A = P(1 + R/200)^(2n). The difference from SI grows larger with more compounding periods.
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Q2
Not Answered
NATIVE
Q2. Find Compound Interest on Rs. 6000 at 10% for 3 years (annual compounding).
Amount = P(1+r/100)^n = 7986. CI = Amount - Principal = 1986.
Q3
Not Answered
NATIVE
Q3. Find the Simple Interest on Rs. 3000 at 10% per annum for 2 years.
SI = PRT/100 = 3000 x 10 x 2/100 = 600.
Q4
Not Answered
NATIVE
Q4. Find Compound Interest on Rs. 7000 at 10% for 3 years (annual compounding).
Amount = P(1+r/100)^n = 9317. CI = Amount - Principal = 2317.
Q5
Not Answered
NATIVE
Q5. Find the Simple Interest on Rs. 9000 at 10% per annum for 2 years.
SI = PRT/100 = 9000 x 10 x 2/100 = 1800.
Q6
Not Answered
NATIVE
Q6. Find Compound Interest on Rs. 3000 at 10% for 2 years (annual compounding).
Amount = P(1+r/100)^n = 3630. CI = Amount - Principal = 630.
Q7
Not Answered
NATIVE
Q7. Find the Simple Interest on Rs. 9000 at 20% per annum for 3 years.
SI = PRT/100 = 9000 x 20 x 3/100 = 5400.
Q8
Not Answered
NATIVE
Q8. Find Compound Interest on Rs. 6000 at 10% for 2 years (annual compounding).
Amount = P(1+r/100)^n = 7260. CI = Amount - Principal = 1260.
Q9
Not Answered
NATIVE
Q9. Find the Simple Interest on Rs. 7000 at 10% per annum for 3 years.
SI = PRT/100 = 7000 x 10 x 3/100 = 2100.
Q10
Not Answered
NATIVE
Q10. For principal Rs. 5000, rate 20% and time 2 years, find (CI - SI).
SI = 2000, CI = 2200. Difference = 2200 - 2000 = 200.
Q11
Not Answered
NATIVE
Q11. Find the Simple Interest on Rs. 6000 at 20% per annum for 2 years.
SI = PRT/100 = 6000 x 20 x 2/100 = 2400.
Q12
Not Answered
NATIVE
Q12. For principal Rs. 9000, rate 20% and time 2 years, find (CI - SI).
SI = 3600, CI = 3960. Difference = 3960 - 3600 = 360.
Q13
Not Answered
NATIVE
Q13. Find the Simple Interest on Rs. 9000 at 20% per annum for 2 years.
SI = PRT/100 = 9000 x 20 x 2/100 = 3600.
Q14
Not Answered
NATIVE
Q14. For principal Rs. 2000, rate 10% and time 3 years, find (CI - SI).
SI = 600, CI = 662. Difference = 662 - 600 = 62.
Q15
Not Answered
NATIVE
Q15. Find the Simple Interest on Rs. 4000 at 10% per annum for 2 years.
SI = PRT/100 = 4000 x 10 x 2/100 = 800.
Q16
Not Answered
NATIVE
Q16. For principal Rs. 3000, rate 20% and time 3 years, find (CI - SI).
SI = 1800, CI = 2184. Difference = 2184 - 1800 = 384.
Q17
Not Answered
NATIVE
Q17. Find the Simple Interest on Rs. 2000 at 20% per annum for 3 years.
SI = PRT/100 = 2000 x 20 x 3/100 = 1200.
Q18
Not Answered
NATIVE
Q18. For principal Rs. 10000, rate 10% and time 2 years, find (CI - SI).
SI = 2000, CI = 2100. Difference = 2100 - 2000 = 100.
Q19
Not Answered
NATIVE
Q19. Find the Simple Interest on Rs. 3000 at 10% per annum for 3 years.
SI = PRT/100 = 3000 x 10 x 3/100 = 900.
Q20
Not Answered
NATIVE
Q20. For principal Rs. 10000, rate 10% and time 3 years, find (CI - SI).
SI = 3000, CI = 3310. Difference = 3310 - 3000 = 310.
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Simple Interest / Compound Interest Formula, shortcuts & preparation guide
Master simple interest / compound interest with regular practice. Key topics include percentage calculations, profit/loss, ratio, and time-work problems. Use shortcut methods for quick calculations and practice 15-20 questions daily to build speed and accuracy. This topic frequently appears in placement aptitude rounds.
Key formulas
- Regular practice improves accuracy
Simple Interest / Compound Interest Practice Questions with Answers
Build speed and accuracy with curated simple interest / compound interest practice. Each quiz includes solved explanations, timed mode, and instant correctness feedback.
How to prepare effectively for this topic?
Practice short timed sets daily, review every explanation, and track recurring mistakes for weekly revision.
Are these questions useful for placements and competitive exams?
Yes. The format mirrors common screening rounds with option-based answers and explanation-driven learning.