Size comparing

A store sells olive oil in three different sizes. Which size is the best buy, and what is its unit price?

Size Price
17 oz $ 8.69
25 oz $11.79
101 oz $46.99

Correct answer:

x =  101 oz

Step-by-step explanation:

$$\begin{gathered} a=8.69\mathrm{/}17={\displaystyle \frac{869}{1700}}\doteq 0.5112{\text{o}}_{\text{z/usd}} \\ b=11.79\mathrm{/}25=0.4716{\text{o}}_{\text{z/usd}} \\ c=46.99\mathrm{/}101\doteq 0.4652{\text{o}}_{\text{z/usd}} \\ c>b>a \\ x=101=101\text{ oz} \end{gathered}$$

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