A shopkeeper sold an article at a loss of 20%. But if he

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A shopkeeper sold an article at a loss of 20%. But if he could sell it at Rs. 200 more, he could earn a profit of 5%. The cost price of the article is

Let the C.P. of article be Rs. y.
According to the question,

		y × 105	-	y × 80	= 200
		100		100

⇒ 105y – 80y = 20000
⇒ 25y = 20000

⇒ y =	20000	= Rs. 800
	25

Using the given formula :
Here, a = 20%, R = 200, b = 5%

C.P. =	R × 100
	b + a

C.P. =	100 × 200
	20 + 5

C.P. =	100 × 200	= Rs. 800
	25