Given,
The cost of 8 dozen boxes of tissue is $198.
As known that,
The are 12 boxes in one dozen.
[tex]8\text{dozen boxes=12}\times8\text{ =96 boxes}[/tex]There are total 196 boxes of cost $198.
The cost of 12 boxes of tissue is,
[tex]\cos t\text{ of 12 box =}\frac{198}{96}\times12=24.75[/tex]Hence, the cost of 12 boxes is $24.75.