General Aptitude

Simple Interest / Compound Interest Tutorial

SI and CI are frequently asked in banking exams. Remember: SI calculates on original principal, CI on principal + accumulated interest.

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Key Formulas

SI = (P × R × T) / 100
Amount = P + SI
CI = P(1 + R/100)^T - P
Amount = P(1 + R/100)^T

Simple Interest (SI)

Open

Calculate simple interest and amount.

Compound Interest (CI)

Open

Calculate compound interest.

Simple Interest (SI)

Calculate simple interest and amount.

When to Use: For questions with SI formula.

Step-by-Step Method

SI = (P × R × T) / 100
Amount = P + SI
P = Principal, R = Rate%, T = Time in years.

Worked Example

Question: Rs. 5000 at 6% p.a. for 5 years. Find SI and Amount.

SI = (5000 × 6 × 5) / 100
SI = (5000 × 30) / 100 = 1500
Amount = 5000 + 1500 = 6500

Final Answer: SI = 1500, Amount = 6500

Option Analysis

1500/6500 = correct
1800/6800 = used wrong rate
3000/8000 = used T=10 instead of 5

Common Mistakes

Using time in months instead of years.
Wrong formula application.
Calculation errors.

Quick Shortcut: SI = P × R × T / 100. Remember P, R, T in years.

Practice This Pattern

5 Q 10 Q 15 Q

Generated 15 focused questions for this pattern.

Q1. Two values are in ratio 2:2. If total is 230, find first value.

Answer: 115

Explanation: Step 1: Total parts = 2+2. Step 2: One part = 230/(4). Step 3: First value = 2 parts = 115.

Q2. Two values are in ratio 3:7. If total is 120, find first value.

Answer: 36

Explanation: Step 1: Total parts = 3+7. Step 2: One part = 120/(10). Step 3: First value = 3 parts = 36.

Q3. Two values are in ratio 2:4. If total is 140, find first value.

Answer: 46

Explanation: Step 1: Total parts = 2+4. Step 2: One part = 140/(6). Step 3: First value = 2 parts = 46.

Q4. Two values are in ratio 7:5. If total is 170, find first value.

Answer: 99

Explanation: Step 1: Total parts = 7+5. Step 2: One part = 170/(12). Step 3: First value = 7 parts = 99.

Q5. Two values are in ratio 5:5. If total is 150, find first value.

Answer: 75

Explanation: Step 1: Total parts = 5+5. Step 2: One part = 150/(10). Step 3: First value = 5 parts = 75.

Q6. Two values are in ratio 3:3. If total is 80, find first value.

Answer: 40

Explanation: Step 1: Total parts = 3+3. Step 2: One part = 80/(6). Step 3: First value = 3 parts = 40.

Q7. Two values are in ratio 4:2. If total is 200, find first value.

Answer: 133

Explanation: Step 1: Total parts = 4+2. Step 2: One part = 200/(6). Step 3: First value = 4 parts = 133.

Q8. Two values are in ratio 6:7. If total is 230, find first value.

Answer: 106

Explanation: Step 1: Total parts = 6+7. Step 2: One part = 230/(13). Step 3: First value = 6 parts = 106.

Q9. Two values are in ratio 3:4. If total is 230, find first value.

Answer: 98

Explanation: Step 1: Total parts = 3+4. Step 2: One part = 230/(7). Step 3: First value = 3 parts = 98.

Q10. Two values are in ratio 2:2. If total is 180, find first value.

Answer: 90

Explanation: Step 1: Total parts = 2+2. Step 2: One part = 180/(4). Step 3: First value = 2 parts = 90.

Q11. Two values are in ratio 2:4. If total is 230, find first value.

Answer: 76

Explanation: Step 1: Total parts = 2+4. Step 2: One part = 230/(6). Step 3: First value = 2 parts = 76.

Q12. Two values are in ratio 6:7. If total is 230, find first value.

Answer: 106

Explanation: Step 1: Total parts = 6+7. Step 2: One part = 230/(13). Step 3: First value = 6 parts = 106.

Q13. Two values are in ratio 3:7. If total is 100, find first value.

Answer: 30

Explanation: Step 1: Total parts = 3+7. Step 2: One part = 100/(10). Step 3: First value = 3 parts = 30.

Q14. Two values are in ratio 4:6. If total is 90, find first value.

Answer: 36

Explanation: Step 1: Total parts = 4+6. Step 2: One part = 90/(10). Step 3: First value = 4 parts = 36.

Q15. Two values are in ratio 7:6. If total is 130, find first value.

Answer: 70

Explanation: Step 1: Total parts = 7+6. Step 2: One part = 130/(13). Step 3: First value = 7 parts = 70.