The difference between the selling prices of an article

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The difference between the selling prices of an article sold at 4% and 3% profits is Rs. 3. The cost price of the article is :

Let the C.P. of article be Rs. y.
According to the question,
(104 – 103)% of y = 3
⇒ 1% × y = 3

⇒	y	= 3 ⇒ y = Rs. 300
	100