On order of $5$ dozen boxes of a product, a retailer receives extra dozen free. What is the equivalent discount for offer? 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: 1. $15\%$ 2. $\frac{97}{6}\%$ 3. $\frac{50}{3}\%$ 4. $20\%$

So, for every 5 dozen he orders, he gets 1 dozen free. This is equivalent of paying for only $\frac{5}{6}$ of your order, therefore, $\frac{1}{6}$ discount.

To convert this to percentage we multiply by 100 to get $\frac{1}{6} \times 100 = \frac{50}{3}$.

So the answer is 3.