చక్కెర ధర 30% పెరిగింది. ఖర్చు పెరగకుండా ఉండాలంటే సీత తన వినియోగాన్ని ఎంత శాతం తగ్గించుకోవాలి?

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RRB ALP CBT I 29 Aug 2018 Shift 1 Official Paper
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  1. \(23\frac{1}{13}\%\)
  2. \(22\frac{1}{13}\%\)
  3. 23%
  4. 22%

Answer (Detailed Solution Below)

Option 1 : \(23\frac{1}{13}\%\)
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Detailed Solution

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ఇచ్చినది:

చక్కెర ధరలో పెరుగుదల % = 25%

ఉపయోగించిన సూత్రం:

ఖర్చు = ధర × పరిమాణం

గణన:

చక్కెరపై ప్రాథమిక ఖర్చులు రూ.100

ఇప్పుడు, ధర 30% పెరిగింది

కొత్త ధర = (100 + 100 × 30%) = 130

ఖర్చు మారకుండా ఉండాలంటే రూ.130 నుంచి రూ.30 తీసివేయాలి.

⇒ 130 - 30 = 100

∴ వినియోగంలో తగ్గుదల = 30/130 × 100 = \(23\frac{1}{13}\%\)

 Shortcut Trick

100 → + 30% → 130 _____ - Y% → 100

ఇప్పుడు, Y = 30/130 × 100 = \(23\frac{1}{13}\%\)

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