চিনির দাম 30% বেড়ে যায়। সীতাকে তার খরচের কত শতাংশ কমাতে হবে যাতে ব্যয় না বাড়ে?

This question was previously asked in
RRB ALP CBT I 29 Aug 2018 Shift 1 Official Paper
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  1. 23%
  2. 22%

Answer (Detailed Solution Below)

Option 1 :
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Detailed Solution

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প্রদত্ত:

চিনির দাম % বৃদ্ধি পেয়েছে = 25%

অনুসৃত সুত্র:

ব্যয় = মূল্য × পরিমাণ

গণনা​:

 ধরা যাক, চিনির প্রাথমিক খরচ ছিল 100 টাকা

এখন, দাম 30% বেড়ে গেছে

নতুন দাম = (100 + 100 × 30%) = 130 টাকা

খরচ অপরিবর্তিত রাখার জন্য, 130 টাকা থেকে 30 টাকা কমাতে হবে।

⇒ 130 - 30 = 100 

∴ খরচ কমে যাওয়ার পরিমাণ = 30/130 × 100 = 

Shortcut Trick

100 →  + 30% → 130 _____ - Y% → 100 

এখন, Y = 30/130 × 100 = 

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