Percentage – Advanced Tricks & Tough Problems
Learn percentage shortcuts to solve bank exam questions quickly and accurately.
1. Important Concepts
- Percentage = (Value / Total) × 100
- x% = x/100
- Increase/Decrease formula
- Successive percentage concept
2. Speed Tricks
- 10% = divide by 10
- 5% = half of 10%
- 1% = divide by 100
- Use fraction conversion (e.g., 25% = 1/4)
- Successive change: a + b + (ab/100)
3. Tough Problems
Q1: Find 25% of 480
Solution:
25% = 1/4
480 ÷ 4 = 120
Q2: A number increases by 20% and then decreases by 20%. Find net change.
Solution:
Net change = 20 − 20 − (20×20/100)
= −4%
Answer = 4% decrease
Q3: Find 15% of 360
Solution:
10% = 36
5% = 18
Total = 36 + 18 = 54
Q4: If 40% of a number is 80, find the number
Solution:
40% = 80
100% = (80 × 100) / 40 = 200
Q5: Population increases by 10% every year. Find increase in 2 years.
Solution:
Total increase = 10 + 10 + (10×10/100)
= 21%
Answer = 21%
4. Exam Tips
- Use fraction equivalents for fast solving
- Avoid long multiplication
- Practice successive percentage formula
- Focus on approximation when needed
Shaktimatha Learning
Quant • Percentage • Bank Exam Preparation
Quant • Percentage • Bank Exam Preparation
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