4% वार्षिक साधारण ब्याज की दर से ₹1,200 कितने वर्षों में ₹2,280 हो जाएँगे?

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RRB NTPC Graduate Level CBT-I Official Paper (Held On: 05 Jun, 2025 Shift 1)
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  1. 23.5
  2. 24.5
  3. 21.5
  4. 22.5

Answer (Detailed Solution Below)

Option 4 : 22.5
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दिया गया है:

मूलधन (P) = ₹1,200

मिश्रधन (A) = ₹2,280

दर (r) = 4% प्रति वर्ष

प्रयुक्त सूत्र:

साधारण ब्याज (SI) = P × r × t / 100

⇒ SI = A - P

गणना:

SI = A - P

⇒ SI = ₹2,280 - ₹1,200 = ₹1,080

SI = P x r x t / 100 का उपयोग करते हुए:

⇒ ₹1,080 = ₹1,200 × 4 × t / 100

⇒ ₹1,080 = ₹48 × t

⇒ t = 22.5 वर्ष

∴ सही उत्तर विकल्प (4) है।

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