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

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