S दो खातों में कुल ₹50,000 जमा करता है जो क्रमशः 8% और 12% वार्षिक साधारण ब्याज देते हैं। एक वर्ष के बाद, उसे कुल ₹5,200 मिलते हैं। 12% ब्याज दर देने वाले खाते में वह कितना पैसा जमा करता है?

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SSC CGL 2023 Tier-I Official Paper (Held On: 25 Jul 2023 Shift 4)
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  1. ₹30,000
  2. ₹32,000
  3. ₹20,000
  4. ₹25,000

Answer (Detailed Solution Below)

Option 1 : ₹30,000
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दिया गया है:

मूलधन (P) = 50,000 रुपये

पहली दर = 8%; दूसरी दर = 12%

कुल साधारण ब्याज (S.I) = 5200 रुपये

प्रयुक्त सूत्र:

साधारण ब्याज (S.I.) = (P × R × T)/100

जहाँ P = मूलधन; R = दर; T = समय

गणना:

मान लीजिए कि 12% की दर पर राशि = x

तो 8% की दर पर राशि = (50,000 - x)

प्रश्न के अनुसार:

⇒ (50,000 - x) × 8% + x × 12% = 5200

⇒​ (50,000 × 8%) - (x × 8%) + (x × 12%) = 5200

⇒ (x × 4%) = 5200 - 4000

⇒ x = (1200 × 100)/4 = 30000 रुपये

∴ सही उत्तर 30000 रुपये है।

 Shortcut Trickगणना:

कुल दर = (5200 × 100)/50000 = 52/5 = 10.4%

F1 SSC Arbaz 6-10-23 D11   

अब

8% पर मिश्रधन : 12% पर मिश्रधन = 1.6 : 2.4

⇒ 2 : 3

⇒ 5 इकाई = 50000

⇒ 3 इकाई = (50000 × 3)/5 = 30000 रुपये

∴ सही उत्तर 30000 रुपये है।

 

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