Hasan sold an article for 56 taka which cost him x taka . If he had gained x% on his outlay, what was his cost ?
- 40 taka
- 45 taka
- 36 taka
- 25
Answer: 40 taka
Explanation: 56 – x /x = x%
56 – x / x = x/100
5600 – 100x = x2
x2 + 100x – 5600 = 0
x2 + 140x – 40x – 5600 = 0
( x – 40) ( x + 140) = 0
x = 40