RRB NTPC CBT-1 previous year question
A shopkeeper purchases rice at ₹60 per kg. While selling, he uses a weighing scale that shows 1 kg when only 900 g is actually weighed. He marks the price 20% above the cost price. Later, he gives a 10% discount on the marked price but continues using the same faulty scale. Find his profit (in ₹) on each transaction where the buyer pays for 1 kg.
Asked in RRB NTPC 2026 — 16 June Shift 1 · Quantitative Aptitude
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Correct answer: (A) ₹10.80
Marked price per claimed kg = 60*1.2=72. After a 10% discount, selling price=64.8 for what's billed as 1 kg, but the faulty scale gives only 900g, whose real cost is 60*0.9=54. Profit per transaction = 64.8-54 = ₹10.80.
हिंदी में प्रश्न
एक दुकानदार ₹60 प्रति kg की दर से चावल खरीदता है। बेचते समय, वह एक ऐसे तराजू का उपयोग करता है जो वास्तव में केवल 900 g वजन को 1 kg दर्शाता है। वह लागत मूल्य से 20% अधिक मूल्य अंकित करता है। बाद में, वह अंकित मूल्य पर 10% का छूट देता है लैकिन वह उसी दौषपूर्ण तराजू का उपयोग करना जारी रखता है। प्रत्येक लेन-देन पर उसका लाभ (₹ में) ज्ञात कीजिए, जहां खरीदार 1 ॥9 चावल के लिए भुगतान करता है।
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सही उत्तर: (A) ₹9.80
प्रति दावा किया गया किलो अंकित मूल्य = 60*1.2=72। 10% छूट के बाद, विक्रय मूल्य=64.8 जो 1 किलो के रूप में बिल किया जाता है, परंतु दोषपूर्ण तराजू केवल 900 ग्राम देता है, जिसकी वास्तविक लागत 60*0.9=54 है। प्रति लेनदेन लाभ = 64.8-54 = ₹10.80।
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