The ratio of the cost price and selling price of an article is 8 : 9. What is the profit percentage?

क्रय मूल्य = 8, विक्रय मूल्य = 9। लाभ = विक्रय मूल्य - क्रय मूल्य = 1। लाभ% = (लाभ / क्रय मूल्य) * 100 = (1 / 8) * 100 = 12.5%।