Simple & Compound Interest – Advanced Tricks + Comparison
Solve SI & CI questions quickly using shortcut formulas and avoid exam traps.
🔥 Shortcut Tricks
- SI = (P × R × T) / 100
- CI = P(1 + R/100)^T
- 2 years → CI − SI = (P × R²)/10000
- Use growth factor method
Solve in 5 Seconds
Q1: SI on ₹1000 at 10% for 1 year?
Answer: ₹100
Q2: Amount after 1 year at 20% on ₹1000?
Answer: 1000 × 1.2 = ₹1200
Exam Level Questions
Q3: Find CI on ₹1000 at 10% for 2 years
Solution:
1000 × (1.1)² = 1210
CI: ₹210
Q4: Find difference between CI and SI for ₹1000 at 10% for 2 years
Shortcut:
(1000 × 10²)/10000 = ₹10
Q5: ₹5000 at 20% for 2 years → Amount?
Solution:
5000 × (1.2)² = 5000 × 1.44
Answer: ₹7200
Q6: ₹1000 becomes ₹1210 in 2 years → Rate?
Solution:
(1 + R/100)² = 1.21
Answer: 10%
❌ Exam Trap
Q: CI and SI are same?
Trap: Only for 1 year
Key Point:
For more than 1 year → CI > SI
Speed Booster Tip
Use growth factor (1 + R/100)^T instead of step-by-step multiplication.
Shaktimatha Learning
Quant • Interest • Bank Exam Preparation
Quant • Interest • Bank Exam Preparation
No comments:
Post a Comment