Question

The cost price of 24 articles is the selling price of 15articles find the gained percentage

Answer 1

Is the following the situation that you describe?

24 (cost) = 15 (cost + markup) = 15(selling price)

Then 9 (cost) = 15 (markup)

so markup = (9/15)cost, or markup = 3/5 of cost

How do you define "gain %"? I think 3/5 = 60% would be a good answer.