एक दुकानदार एक वस्तु को 10% और 20% की क्रमिक छूट पर बेचने पर 44% का कुल लाभ कमाता है। कुल लाभ प्रतिशत ज्ञात कीजिए, यदि दुकानदार उसी वस्तु को 15% की छूट पर बेचता है।

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SSC CGL 2022 Tier-I Official Paper (Held On : 01 Dec 2022 Shift 2)
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  1. 50%
  2. 70%
  3. 30%
  4. 40%

Answer (Detailed Solution Below)

Option 2 : 70%
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दिया गया है:

एक दुकानदार एक वस्तु को 10% और 20% की क्रमिक छूट पर बेचने पर 44% का कुल लाभ कमाता है।

प्रयुक्त अवधारणा:

1. विक्रय मूल्य = अंकित मूल्य × (1 - छूट%)

2. विक्रय मूल्य = क्रय मूल्य × (1 + लाभ%)

गणना:

अंतिम छूट% = \(10 + 20 - \frac {10 × 20}{100}\) = 28%

मान लीजिये कि अंकित और क्रय मूल्य क्रमशः = \(10 + 20 - \frac {10 × 20}{100}\) = 28% हैं।

प्रश्न के अनुसार,

MP(1 - 28%) = CP(1 + 44%)

⇒ 0.72 × MP = 1.44 × CP

⇒ MP = 2CP

यदि, 15% छूट की अनुमति दी जाती है तो विक्रय मूल्य

⇒ MP(1 - 15%)

⇒ 0.85MP

⇒ 0.85 × 2CP = 1.7CP

अब, लाभ% = \(\frac {1.7CP - CP}{CP} \times 100\%\) = 70%

∴ कुल लाभ 70% है।

Shortcut Trick

अंतिम छूट% = \(10 + 20 - \frac {10 × 20}{100}\) = 28%

तो, MP : SP = 100 : 72 

यहाँ, दुकानदार 44% का कुल लाभ कमाता है

तो, CP : SP = 100 : 144

अब, CP : SP : MP = 100 : 144 : 200

अब, 15% छूट दी गई तो SP = 200 × 85/100 = 170

तो, लाभ% 70/100 × 100 = 70%

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