Question : If the cost price of 15 pencils is equal to the selling price of 10 pencils, what is the gain or loss percentage?

Option 1: 20% gain

Option 2: 30% gain

Option 3: 50% gain

Option 4: 40% loss

Question : If the cost price of an article is 80 percent of its selling price, then what is the profit percentage?

Option 1: 50%

Option 2: 33.33%

Option 3: 25%

Option 4: 30%

Question : The cost price of 50 articles is the same as the selling price of $x$ articles. If there is a profit of 25 percent, then what is the value of $x$?

Option 1: 20

Option 2: 40

Option 3: 30

Option 4: 25

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

Option 1: 50% gain

Option 2: 60% loss

Option 3: 30% loss

Option 4: 90% gain

Question : If the selling price of 9 boxes is equal to the cost price of 15 boxes. The gain percentage is (The selling price of all boxes is the same and the cost price of all boxes is the same):

Option 1: $\frac{50}{3}\%$

Option 2: $\frac{200}{3}\%$

Option 3: $\frac{100}{3}\%$

Option 4: $\frac{140}{3}\%$