Hasan sold an article for 56 taka which cost him x taka. If he had gained x% on his outlay, what was his cost?
সমাধান
সঠিক উত্তর: Option A
Hasan sold an article for 56 taka which cost him x taka
So, Profit = (56-x)
Again he had gained x% on his outlay,
So Profit = x*x/100
We get,
x2/100 = 56 - x
x2/100 +x- 56 =
x2 +100x -5600 = 0
x2 + 140x -40x -5600 = 0
x(x + 140) - 40 (x + 140) =0
(x-40) (x+140)=0
x=40
