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Answer with Explanation:
Let C.P. of each article be Re. 1 C.P. of x articles = Rs. x.
S.P. of x articles = Rs. 20.
Profit = Rs. (20 - x).
Therefore, 20 - x /x * 100 = 25
=> 2000 - 100x = 25x
125x = 2000
=> x = 16.
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