A sum, when invested at 10% simple interest per annum, amounts to ₹2640 after 2 years. What is the simple interest (in ₹) on the same sum at the same rate of interest in 1 year?

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RPF Constable 2024 Official Paper (Held On 03 Mar, 2025 Shift 1)
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  1. 880
  2. 220
  3. 110
  4. 440

Answer (Detailed Solution Below)

Option 2 : 220
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Detailed Solution

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Given:

Amount (A) = ₹2640

Rate (R) = 10%

Time (T) = 2 years

Formula used:

Simple Interest (SI) = Principal (P) × Rate (R) × Time (T) / 100

Amount (A) = Principal (P) + Simple Interest (SI)

Calculations:

2640 = P + (P × 10 × 2) / 100

⇒ 2640 = P + P × 0.2

⇒ 2640 = P × (1 + 0.2)

⇒ 2640 = P × 1.2

⇒ P = 2640 / 1.2

⇒ P = 2200

Now, calculate the simple interest for 1 year:

SI = 2200 × 10 × 1 / 100

⇒ SI = 2200 × 0.1

⇒ SI = 220

∴ The correct answer is option (2).

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