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1. Hasan sold an artical for 56 taka which cost him x taka. If he had gained x% on his outlay, what was his cost?
- A. 40 taka
- B. 40 taka
- C. 40 taka
- D. 40 taka
Answer: Option A
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
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