Question

Mr. Karma started a Coaching classes and for that he wanted to purchase 50 chairs for the classroom cost of which was Rs.200 each. The trader offered him a discount only if he purchases a set of 60 chairs. So he calculated that those 10 extra chairs are costing him only Rs. 80 each after the discount. What is the Percentage discount given by the shopkeeper?  

A 10%
B 15%
C 12%
D 20%
E 30%
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