Given that;
a.
He can buy 64 fl oz at the grocery store for $2.00.
So, the unit price for the grocery store will be;
[tex]\begin{gathered} P_1=\frac{\text{ \$2.00}}{\text{64 fl oz}} \\ P_1=\text{ \$0.031 per fl oz} \end{gathered}[/tex]b.
Also, He can buy 256 fl oz at the wholesale club for $7.50.
So, the unit price for the wholesale club is;
[tex]\begin{gathered} P_2=\frac{\text{ \$7.50}}{\text{256 fl oz}} \\ P_2=\text{ \$}0.029\text{ per fl oz} \end{gathered}[/tex]c.
So, for Ben to buy at the best deal he should buy at the wholesale club. This is the wholesale club has a lower unit price when compared to the grocery store.