Bank Exam Practice Material Series – Page 12
Compound Interest Tricks, Speed Maths & Important Concepts
Shaktimatha Learning – Quantitative Aptitude Practice Hub
Learn Compound Interest shortcut tricks, amount calculations, growth formulas, and fast solving techniques for Bank Exams, SSC, Railways, Insurance, and Competitive Exams.
Learn Compound Interest shortcut tricks, amount calculations, growth formulas, and fast solving techniques for Bank Exams, SSC, Railways, Insurance, and Competitive Exams.
Importance of Compound Interest
Compound Interest is one of the most important arithmetic topics in competitive exams. This topic helps students improve:
- Percentage calculations
- Financial mathematics understanding
- Logical reasoning
- Calculation speed
- Problem-solving ability
Important Compound Interest Concepts
- Principal Amount
- Rate of Interest
- Time Period
- Compound Amount
- Growth Percentage
- Difference Between SI & CI
Compound Interest Formula
0
Compound Interest Calculation
1
Speed Tricks for Compound Interest
Compound Interest Shortcut
Principal = 1000
Rate = 10%
Time = 2 years
Calculation:
21000 × (1.1)²
1000 × 1.21
Amount = 1210
Compound Interest = 210
Growth Percentage Trick
If value increases by 20%:
Multiply by:
1.20
If value decreases by 20%:
Multiply by:
0.80
Difference Between SI & CI
Principal = 1000
Rate = 10%
Time = 2 years
Simple Interest = 200
Compound Interest = 210
Difference = 10
Important Percentage Growth Values
| Percentage | Multiplier | Percentage | Multiplier |
|---|---|---|---|
| 10% | 1.10 | 20% | 1.20 |
| 25% | 1.25 | 50% | 1.50 |
| 5% | 1.05 | 15% | 1.15 |
Practice Questions
Question 1
Principal = 2000
Rate = 10%
Time = 2 years
Find Amount
3Answer = 2420
Question 2
Principal = 5000
Amount = 6050
Find Compound Interest
6050 − 5000
Answer = 1050
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