On an order of 5 dozen boxes of a consumer product, a retailer receives an extra dozen free. This is equivalent to allowing him a discount of? Choose the most appropriate option.
A) 16 2/37% B) 16 2/3% C) 16 6/3% D) 12 2/3% E) 16 3/3%
Clearly, the retailer gets 1 dozen out of 6 dozens free.   Equivalent discount = 1/6 * 100 = 16 2/3%.Answer: 16 6/3%
<result>C</result>
On an order of 5 dozen boxes of a consumer product, a retailer receives an extra dozen free. This is equivalent to allowing him a discount of?