चीनी के मूल्य में 30% की वृद्धि हो जाती है। सीता को चीनी की खपत कितने प्रतिशत कम कर देनी चाहिए जिससे कि उसके व्यय में कोई वृद्धि न हो? 

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RRB ALP CBT I 29 Aug 2018 Shift 1 Official Paper
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  1. 23%
  2. 22%

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दिया गया है:

चीनी के मूल्य में % वृद्धि = 25% 

प्रयुक्त सूत्र:

व्यय = मूल्य × मात्रा

गणना:

माना चीनी पर शुरुआती व्यय 100 रुपये था। 

अब, मूल्य में 30% की वृद्धि होती है। 

नया मूल्य = (100 + 100 × 30%) = 130

व्यय को अपरिवर्तित रखने के लिए, 130 रुपये से 30 रुपये कम करना होगा।

⇒ 130 - 30 = 100 

व्यय में कमी = 30/130 × 100 = 

Shortcut Trick

100 →  + 30% → 130 _____ - Y% → 100 

अब, Y = 30/130 × 100 = 

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