alleryপুরানো এবং নতুন মূল্যের অনুপাত 4 : 5। খরচ অপরিবর্তিত রাখতে, পুরানো ও নতুন ব্যবহারের অনুপাত হলো
A4 : 5
B5 : 4
C25 : 16
D16 : 25
Answer & Solution
Correct answer: B. 5 : 4
খরচ স্থির থাকলে, ব্যবহার মূল্যের সাথে ব্যস্তানুপাতিকভাবে পরিবর্তিত হয়, তাই এটি হলো 5 : 4।
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