एक आदमी एक कंपनी में कुल 10,000 रुपये का निवेश करता है। धनराशि का एक भाग 10% प्रति वर्ष साधारण ब्याज पर और शेष भाग 15% प्रति वर्ष साधारण ब्याज पर निवेश किया गया था। यदि दो वर्षों में उसका कुल अर्जित ब्याज 2,400 रुपये के बराबर है, तो प्रति वर्ष 15% साधारण ब्याज पर निवेश की गई धनराशि कितनी है?

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SSC CGL 2023 Tier-I Official Paper (Held On: 14 Jul 2023 Shift 3)
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  1. 8,000 रुपये 
  2. 4,000 रुपये 
  3. 6,000 रुपये 
  4. 5,000 रुपये 

Answer (Detailed Solution Below)

Option 2 : 4,000 रुपये 
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दिया गया है:

मूलधन = 10,000 रुपये

धनराशि का कुछ भाग 15% पर उधार दिया गया

इसका कुछ भाग 10% पर उधार दिया गया

कुल अर्जित ब्याज = 2400 रुपये

समय = 2 वर्ष

प्रयुक्त सूत्र:

ब्याज = (मूलधन × दर × समय)/100

गणना:

माना 15% पर उधार दी गई धनराशि x है

तब 10% पर उधार दी गई धनराशि (10,000 - x) होगी

2400 = [(x × 15 × 2)/100] + [(10,000 - x) × 10 × 2]/100

2400 = (3x/10) + [(10,000 - x)/5]

2400 = (3x + 20,000 - 2x)/10

⇒ 24,000 = 20,000 + x

⇒ x = 4,000 रुपये

प्रति वर्ष 15% साधारण ब्याज पर निवेश की गई धनराशि 4000 रुपये है।

Shortcut Trick10,000 पर कुल साधारण ब्याज = (10000 × 2 × R)/ 100 = 2400

R = 12%

 F3 SSC Savita 09-10-23 D8

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