प्रति वर्ष किस ब्याज दर (प्रतिशत में) पर साधारण ब्याज पर एक धनराशि 5 वर्षों में दोगुनी हो जाएगी?

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RRB NTPC Graduate Level CBT-I Official Paper (Held On: 05 Jun, 2025 Shift 3)
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  1. 20%
  2. 22%
  3. 18%
  4. 40%

Answer (Detailed Solution Below)

Option 1 : 20%
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Detailed Solution

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दिया गया है:

समय (T) = 5 वर्ष

राशि दोगुनी हो जाएगी ⇒ साधारण ब्याज = मूलधन (P)

प्रयुक्त सूत्र:

SI = (P × R × T) ÷ 100

गणना:

यदि SI = P, तो:

P = (P × R × 5) ÷ 100

⇒ 1 = (R × 5) ÷ 100

⇒ R = 100 ÷ 5 = 20%

∴ आवश्यक ब्याज दर = 20% प्रति वर्ष

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