A seller charges 28% more from a customer as GST on an article. If customer paid Rs. 4544, what is the cost price of the article?

Let the cost price of the article be 'P'

Then from given data,

$P + \frac{28P}{100} = 4544=> 128P = 454400=> P = 3550$

Hence, the cost price of the article = P = Rs. 3550