8% साधारण ब्याज पर कोई धनराशि \(3\frac{1}{2}\) वर्षों में ₹ 608 हो जाती है। निवेश की गई राशि थी ?

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RRB ALP CBT I 30 Aug 2018 Shift 3 Official Paper
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  1. ₹ 450
  2. ₹ 475
  3. ₹ 440
  4. ₹ 460

Answer (Detailed Solution Below)

Option 2 : ₹ 475
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दिया गया है:

प्रति वर्ष 8% साधारण ब्याज पर कोई धनराशि \(3\frac{1}{2}\) अर्थात 3.5 वर्षों में 608 रुपये हो जाती है।

प्रयुक्त अवधारणा:

साधारण ब्याज, SI = (P × R × T)/100

मिश्रधन = P + SI

जहाँ, 

P = मूलधन

R = प्रति वर्ष ब्याज की दर

T = समय, वर्षों में

गणना:

माना निवेश की गई राशि P है।

प्रश्नानुसार,

P + (P × 8 × 3.5)/100 = 608

⇒ P + 0.28P = 608

⇒ 1.28P = 608

⇒ P = 608/1.28

⇒ P = 475

∴ निवेश की गई राशि 475 रुपये है।

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