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HomeSSC GDSsc Gd MathB5. Simple & Compound Interest (ब्याज)
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B • Maths

B5. Simple & Compound Interest (ब्याज)

SI • CI • Amount • Growth

Chapter Overview (English + हिंदी)

Most SSC GD questions ask simple interest. Compound interest appears as 2-year quick formula or growth factor.

SSC GD में Simple Interest ज्यादा पूछा जाता है। CI भी कभी-कभी 2 साल के लिए या growth factor के रूप में आता है।

Professor Tip: पहले formula याद, फिर 5 सवाल speed से, फिर 1-2 सवाल deep समझ से.

Important Formulas / महत्वपूर्ण सूत्र

SI = (P×R×T)/100
Amount (SI) = P + SI
Amount (CI) = P×(1+R/100)^T
CI for 2 years = P×(R/100)×(2 + R/100)

Quick Tricks / त्वरित ट्रिक्स

  • R% = R/100; 10% = 0.1
  • 2 years CI shortcut याद करो.
  • Amount factor method: ×(1+r).

Practice MCQs (6) – Answer Hidden by Default

Click “Show Answer” for each question. (SSC GD level)

Q1. Find SI on ₹1000 at 10% for 2 years.
₹1000 पर 10% से 2 साल का SI?
Answer: B (₹200)
Explanation: SI=1000×10×2/100=200.
Trick: P×R×T/100
Q2. Amount after SI on ₹800 at 5% for 3 years:
₹800 पर 5% SI, 3 साल बाद राशि:
Answer: C (₹920)
Explanation: SI=800×5×3/100=120 ⇒ Amount=920.
Trick: SI निकालकर add.
Q3. CI on ₹1000 at 10% for 1 year:
₹1000 पर 10% CI (1 साल):
Answer: B (₹100)
Explanation: For 1 year, CI=SI=100.
Trick: 1 year में CI=SI.
Q4. Amount at CI: P=2000, R=10%, T=2 years (approx)
CI राशि: P=2000, 10%, 2 साल:
Answer: A (2420)
Explanation: A=2000×1.1²=2000×1.21=2420.
Trick: 1.1²=1.21 याद रखें.
Q5. CI for 2 years on ₹5000 at 5% is:
₹5000 पर 5% CI (2 साल) =
Answer: A (₹512.5)
Explanation: CI=5000×0.05×(2+0.05)=5000×0.05×2.05=512.5
Trick: 2-year shortcut formula.
Q6. If amount becomes 1100 at 10% in 1 year, principal is:
10% पर 1 साल में राशि 1100, मूलधन?
Answer: A (1000)
Explanation: A=P×1.1 ⇒ P=1100/1.1=1000.
Trick: Divide by 1.1
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