If the difference between the selling prices of an article

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If the difference between the selling prices of an article at profit of 6% and 4% is $ 3, then the cost price of the article should be :

Suppose the cost price of article be y, then
Given in question ,
( 6 - 4 ) % of y = 3
⇒ 2% of y = 3

⇒ y =	3 × 100	= $ 150
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