If marked price of an article an article is 30% more than

If marked price of an article an article is 30% more than its cost price and 10% discount is given, then profit per cent is

Here, r = 30% and r₁ = 10%
∴ Profit per cent = [{r x (100 - r₁)}/100] - r₁
= [30 x (100 - 10)/100] - 10
= [30 x 90/100] - 10
= 27 -10 = 17%