On an order of 9 dozen boxes of a consumer product, a retailer receives an extra dozen free. This is equivalent to allowing him a discount of: Choose the correct choice from the following:
A) 10%
B) 15%
C) 20%
D) 25%
E) 30%
Clearly, the retailer gets 1 dozen out of 10 dozens free.   Equivalent discount = 1/10 * 100= 
<gadget id="calculator">1/10 * 100</gadget>
<output>10</output>
10%.   10%nswer 10%) 10%
<result>A</result>
On an order of 9 dozen boxes of a consumer product, a retailer receives an extra dozen free. This is equivalent to allowing him a discount of: