एक मूलधन को 4 वर्ष के लिए 7.5% वार्षिक साधारण ब्याज की दर से निवेश किया गया। यदि निवेश 5 वर्ष के लिए होता, तो अर्जित ब्याज 375 रुपये अधिक होता। निवेश किया गया आरंभिक मूलधन कितना था?

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RRB ALP Previous Paper 2 (Held On: 9 Aug 2018 Shift 2)
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  1. 4,500 रुपये
  2. 5,000 रुपये
  3. 3,750 रुपये
  4. 4,750 रुपये

Answer (Detailed Solution Below)

Option 2 : 5,000 रुपये
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5 वर्ष में अर्जित ब्याज – 4 वर्ष में अर्जित ब्याज = 375 रुपये

माना मूलधन P रुपये है,

⇒ (P × 7.5 × 5) /100 – (P × 7.5 × 4) /100 = 375

⇒ (37.5 × P) /100 – (30 × P) /100 = 375

⇒ (7.5 × P) /100 = 375

∴ P = 5000 रुपये
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