If the difference between the simple interest and the compound interest on a certain sum of money for 3 years at the rate of 5% per annum is Rs. 122, then the sum is:

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  1. Rs. 16,000
  2. Rs. 12,000
  3. Rs. 8,000
  4. Rs. 10,000

Answer (Detailed Solution Below)

Option 1 : Rs. 16,000
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Detailed Solution

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Given:

The difference between Simple Interest (SI) and Compound Interest (CI) for 3 years = ₹122

Rate of Interest (r) = 5% per annum

Time (t) = 3 years

Formula used:

Difference between CI and SI for 3 years = P × (r/100)2 × (3 + r/100)

Where P = Principal

Calculation:

122 = P × (5/100)2 × (3 + 5/100)

⇒ 122 = P × (25/10000) × (3 + 0.05)

⇒ 122 = P × (25/10000) × 3.05

⇒ 122 = P × (76.25/10000)

⇒ P = (122 × 10000) / 76.25

⇒ P = ₹16,000

∴ The correct answer is option (1).

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