A tradesman sold an article at a loss of 20%. If the selling price had been increased by 100 taka, there would have been a gain of 5%. What was the cost price of the article?

A 375 taka

B 400 taka

C 425 taka

D 450 taka

Solution

Correct Answer: Option B

মনে করি ,ক্রয়মূল্য =100x টাকা
          অতএব , বিক্রয়মূল্য =80x টাকা
এবং 5% লাভে    "               =105x
প্রশ্নমতে ,105x-80x=100 টাকা
          বা,25x=100
         বা,x=4
অতএব, ক্রয়মূল্য =100×4=400 টাকা

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