The cost price of 27 articles is the same as the selling price of 18 articles. What is the gain or loss percentage?

50% gain 60% loss 30% loss 90% gain

50% gain

Cost price of 27 articles = Selling price of 18 articles \(\frac{CP}{SP}\) =  \(\frac{18}{27}\) Profit = 9 Profit% = 9 × \(\frac{100}{18}\)  = 50%