RRB NTPC CBT-1 previous year question
The price of an article is increased by 20%. In the next step, it is decreased by x% of the new price. Finally, the price is increased by 10% of the original price. If the final price becomes exactly equal to the original price, the value of x is:
Asked in RRB NTPC 2026 — 18 June Shift 2 · Quantitative Aptitude
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Correct answer: (C) 25
With original price P: after +20% it becomes 1.2P; after decreasing by x% of this it becomes 1.2P(1-x/100); adding 10% of the original (0.1P) must equal P. Solving 1.2(1-x/100)+0.1=1 gives x = 25.
हिंदी में प्रश्न
किसी वस्तु की कीमत में 20% की वृद्धि की जाती है। अगले चरण में, इसमें नई कीमत के x% की कमी का जाती है। अंत में, MAA में मूल कीमत के 10% को वृद्धि को जाती Fl यदि अंतिम कीमत, मूल कीमत के ठीक बराबर हो जाती है, तो x का मान कितना होगा?
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सही उत्तर: (C) 12.25
मूल मूल्य P के साथ: 20% वृद्धि से 1.2P होता है; इसमें से x% घटाने पर 1.2P(1-x/100) होता है; मूल मूल्य का 10% (0.1P) जोड़ने पर परिणाम P के बराबर होना चाहिए। 1.2(1-x/100)+0.1=1 हल करने पर x = 25 प्राप्त होता है।
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