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

Simple Interest (SI)

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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

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

Worked Example

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

  1. SI = (5000 × 6 × 5) / 100
  2. SI = (5000 × 30) / 100 = 1500
  3. Amount = 5000 + 1500 = 6500

Final Answer: SI = 1500, Amount = 6500

Option Analysis

Common Mistakes

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

Practice This Pattern

5 Q 10 Q 15 Q

Generated 10 focused questions for this pattern.

Q1. Two values are in ratio 7:2. If total is 120, find first value.

  • 96
  • 90
  • 99
  • 93

Answer: 93

Explanation: Step 1: Total parts = 7+2. Step 2: One part = 120/(9). Step 3: First value = 7 parts = 93.

Q2. Two values are in ratio 5:5. If total is 200, find first value.

  • 97
  • 103
  • 106
  • 100

Answer: 100

Explanation: Step 1: Total parts = 5+5. Step 2: One part = 200/(10). Step 3: First value = 5 parts = 100.

Q3. Two values are in ratio 3:7. If total is 170, find first value.

  • 48
  • 54
  • 51
  • 57

Answer: 51

Explanation: Step 1: Total parts = 3+7. Step 2: One part = 170/(10). Step 3: First value = 3 parts = 51.

Q4. Two values are in ratio 4:4. If total is 90, find first value.

  • 42
  • 45
  • 48
  • 51

Answer: 45

Explanation: Step 1: Total parts = 4+4. Step 2: One part = 90/(8). Step 3: First value = 4 parts = 45.

Q5. Two values are in ratio 3:4. If total is 180, find first value.

  • 77
  • 74
  • 83
  • 80

Answer: 77

Explanation: Step 1: Total parts = 3+4. Step 2: One part = 180/(7). Step 3: First value = 3 parts = 77.

Q6. Two values are in ratio 2:2. If total is 190, find first value.

  • 101
  • 92
  • 98
  • 95

Answer: 95

Explanation: Step 1: Total parts = 2+2. Step 2: One part = 190/(4). Step 3: First value = 2 parts = 95.

Q7. Two values are in ratio 3:2. If total is 90, find first value.

  • 57
  • 51
  • 54
  • 60

Answer: 54

Explanation: Step 1: Total parts = 3+2. Step 2: One part = 90/(5). Step 3: First value = 3 parts = 54.

Q8. Two values are in ratio 7:4. If total is 210, find first value.

  • 139
  • 130
  • 133
  • 136

Answer: 133

Explanation: Step 1: Total parts = 7+4. Step 2: One part = 210/(11). Step 3: First value = 7 parts = 133.

Q9. Two values are in ratio 3:4. If total is 200, find first value.

  • 91
  • 82
  • 85
  • 88

Answer: 85

Explanation: Step 1: Total parts = 3+4. Step 2: One part = 200/(7). Step 3: First value = 3 parts = 85.

Q10. Two values are in ratio 7:5. If total is 180, find first value.

  • 102
  • 111
  • 108
  • 105

Answer: 105

Explanation: Step 1: Total parts = 7+5. Step 2: One part = 180/(12). Step 3: First value = 7 parts = 105.