The selling price of an article is Tk. 39. If its cost price is numerically equal to its profit precent, then its cost price is-

The selling price of an article is Tk. 39. If its cost price is numerically equal to its profit precent, then its cost price is- Correct Answer 30

মনেকরি, ক্রয়মূল্য = x টাকা .:. লাভ = x% প্রশ্নমতে, x + x এর x% = 39 ⇒ x + x × x100 = 39⇒100x + x2100 = 39 ⇒  x2 + 100x - 3900 = 0 ⇒  x2 + 130x - 30x - 3900 = 0 ⇒ x(x + 130) - 30(x + 130) = 0 ⇒ (x + 130)(x - 30) = 0 .:. x = 30 [যেহেতু, x # - 130]
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