Question

which is the better buy a 12 oz box of cereal for $3 or an 8 ounce box of cereal for $4

Answer 1

We determine that by calculating the cost of buying one Oz for each case, that is:

$p_1=\frac{1\cdot3}{12}\Rightarrow p_1=\frac{1}{4}\Rightarrow p_1=0.25$$p_2=\frac{1\cdot4}{8}\Rightarrow p_2=\frac{1}{2}\Rightarrow p_2=0.5_{}$

Here p1 and p2 represent the cost of 1 Oz for the 12 Oz and 8 Oz scenarios given, from this we have that is better to buy a 12 Oz box of cereal for $3 since we would be buying 1 Oz for $0.25.