Solution:
The following are the price for brands of cereal;
[tex]\begin{gathered} w\Rightarrow\text{ \$}3.98:20oz \\ \\ x\operatorname{\Rightarrow}\text{ \$}2.52:14oz \\ \\ y\Rightarrow\text{ \$}4.80:32oz \\ \\ z\Rightarrow\text{ \$}3.92:28oz \end{gathered}[/tex]The best buy would be the brand with the least unit cost. Thus, the unit cost for each brand is;
[tex]\begin{gathered} w\Rightarrow\frac{3.98}{20} \\ \\ w\Rightarrow\text{ \$}0.20\text{ per unit} \\ \\ x\Rightarrow\frac{2.52}{14} \\ \\ x\Rightarrow\text{ \$}0.18\text{ per unit} \\ \\ y\Rightarrow\frac{4.80}{32} \\ \\ y\Rightarrow\text{ \$}0.15\text{ per unit} \\ \\ z\Rightarrow\frac{3.92}{28} \\ \\ z\Rightarrow\text{ \$}0.14 \end{gathered}[/tex]CORRECT OPTION:
