A shopkeeper sells an article for Rs 78 and earns double the profit that he would have earned on selling this article for Rs 69. Find the Cost Price of this article.

60

Let the Cost Price (CP) of the article be ₹x.

Profit when sold for ₹78:

$78 - x$

Profit when sold for ₹69:

$69 - x$

Given that the profit at ₹78 is double the profit at ₹69:

$78 - x = 2(69 - x)$

Expanding:

$78 - x = 138 - 2x$

$x = 138 - 78 = 60$

Therefore, the Cost Price is: 60