Ten articles were bought for Rs. 8, and sold at 8 for Rs.

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Ten articles were bought for Rs. 8, and sold at 8 for Rs. 10. The gain percent is

Let 40 articles (LCM of 8 and 10) be bought.
C.P of 1 article = Rs. 8

∴ C.P of 40 articles =	8 × 40	= Rs. 32
	10

S.P of 1 article = Rs. 10

S.P. of 40 articles =	10 × 40	= Rs. 50
	8

Profit = S.P. of 40 articles - C.P. of 40 articles = 50 - 32 = Rs. 18

∴ Profit percent =	Profit	× 100
	C.P. of 40 articles

Profit percent =	1800	= 56.25%
	32

We can find gain % with the help of given formula :
Here, a = 10, p = 8 and b = 8, q = 10

Gain % =			aq - bp		× 100
			bp

Gain % =			10 × 10 - 8 × 8		× 100
			8 × 8

Gain % =	36	× 100
	64

Gain % =	1800	= 56.25%
	32