A tradesman sold an article at a loss of 0%. If the selling price had been increased by 100 taka, there would have been a gain of 5%. What was the cost price of the article?

প্রশ্নঃ A tradesman sold an article at a loss of 0%. If the selling price had been increased by 100 taka, there would have been a gain of 5%. What was the cost price of the article?