# A Trader marks his goods 20% above cost price but allows his customers a discount of 10%, the cost price of a blackboard, which is sold for  216, is

 [ A ]     196 [ B ]     180 [ C ]     200 [ D ]     108
 Answer : Option C Explanation : Selling price = 216 Discount = 10% Marked price =  (216X$100\over90$) = 240 So, Cost price =(240X$100\over120$) = `200