A person sold a music system to another person at 20% gain and the second person sold it to third person at 40% gain. If the third person paid ₹10,500 for the music system, what amount did the 1st person pay for the music system?एक व्यक्ति ने एक म्यूज़िक सिस्टम दूसरे व्यक्ति को 20% लाभ पर बेचा और दूसरे व्यक्ति ने उसे तीसरे व्यक्ति को 40% लाभ पर बेच दिया। यदि तीसरे व्यक्ति ने म्यूज़िक सिस्टम के लिए ₹10,500 दिए, तो पहले व्यक्ति ने म्यूज़िक सिस्टम के लिए कितनी राशि दी थी?
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Correct answer: B. ₹6,250
Explanation
Let the first person's cost be x. Then x × 1.2 × 1.4 = 10,500 ⇒ 1.68x = 10,500 ⇒ x = ₹6,250.माना पहले व्यक्ति का क्रय मूल्य x है। तब x × 1.2 × 1.4 = 10,500 ⇒ 1.68x = 10,500 ⇒ x = ₹6,250।More Mathematical Reasoning and Aptitude questions
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