Question

THE cp of 20 articles is same as the selling price of 12 articles find gain or loss as percent

Answer 1

let's take cost price of each particle be 6x.
Cost price of 20 particles = Selling price of 12 articles => 20(6x) = 12(selling price of an article) =>
120x=12(selling price of an article) =>120x/12 = 10x = selling price of an article. Profit =selling price -cost price =12x-10x =2x . Profit%= 2x/10x ×100 =20%. Hope it helps you...