The ratio of the C.P. and S.P. of an article is 20 : 21.

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The ratio of the C.P. and S.P. of an article is 20 : 21. What is the gain percent?

Here , The ratio of the C.P. and S.P. of an article = 20 : 21
Let the C.P. and S.P. of an article are 20k and 21k .
Gain = 21k - 20k = k

Gain% =	k	× 100
	20k

Gain% =	1	× 100 = 5%
	20