Answer:
See Explanation
Step-by-step explanation:
The gallon sizes and prices are given below:
[tex]\left|\begin{array}{c|c|C}Gallon\: Size&Price(\$)&\text{Unit Price Per Gallon}\\--------------&-----&---------\\4\text{(with 50\% Extra)}=6 \:Gallons&36&36\div 6=\$6 \:per\:gallon \\3&24&24\div 3=\$8 \:per\:gallon\\2 &20&20\div 2=\$10\:per\:gallon\end{array}\right|[/tex]