The correct option is C 10%
Given that,
List price of an article (M.P) = ₹ 400
Selling price of an article (S.P) = ₹360
∴ Amount of discount = M.P - S.P
= ₹ (400 - 360)
= ₹ 40
So, the amount of discount on the article is ₹ 40.
∴Discount percent=Discount×100M.P
=40×100400
=10%
Hence, the discount percent of the article is 10%.