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1. By selling an article for Tk.144, a man gained such that the percentage gain equals the cost price. The CP of the article is--
- A. 72
- B. 72
- C. 72
- D. 72
Answer: Option B
Explanation:
let x be the cost price. so the profit percent is x too
Selling price = x + (x*x)/100
144 = x+ x*x/100
x2+100x-14400 =0
x =-180 or x= 80
So CP =80.
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