alleryযদি চেনিৰ দাম 25% বৃদ্ধি পায়, তেন্তে খৰচ অপৰিৱৰ্তিত ৰাখিবলৈ খৰচ কিমান শতাংশ হ্ৰাস পাব লাগিব?
A15%
B20%
C25%
D30%
Answer & Solution
Correct answer: B. 20%
প্ৰয়োজনীয় পতন = r/(100+r) x 100 = 25/125 x 100 = 20%।
**পৰীক্ষা কৰক:** নতুন খৰচ = 1.25 x 0.80 = 1.0, অপৰিৱৰ্তিত।
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