Question

Mansi wanted to purchase 36 speakers whose cost was Rs. 600 each. The trader offered her a discount if she were to purchase a set of 40 speakers. So she calculated that if she assume the normal price of 36 speakers then she can purchase 4 extra speakers which cost her only Rs. 210 each of four speakers at the cost price of 36 speakers after discount. What is the percentage discount?

A 6.5 %
B 5 %
C 6%
D 9%
E None of these
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