If the cost price of 10 articles equals selling price of

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If the cost price of 10 articles equals selling price of 9 articles, the gain or loss per cent will be

1. 11 1 % loss
  9
2. 1 1 % loss
  9
3. 1 1 % gain
  9
4. 11 1 % gain
  9

Correct Option: D

Let C.P. of each article be Re. 1.
∴ C.P. of 9 articles = Rs. 9
∴ S.P. of 9 articles = Rs. 10
Profit = S.P. of 9 articles - C.P. of 9 articles = 10 - 9 = Rs. 1

∴ Profit percent =	Profit	× 100
	C.P. of 9 articles

Profit percent =		1	× 100 =	100	= 11	1	%
		9		9		9

We can find gain % with the help of given formula :
Here, p = 10, q = 9

Gain % =			p - q		× 100
			q

Gain % =			10 - 9		× 100
			9

Gain % =		1	× 100 = 11	1	%
		9		9

11	1	% loss
	9

1	1	% loss
	9