To find the cost per serving, we can calculate the cost per serving for both the 3 servings and the 10 servings and see if they are consistent.
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For 3 servings: \[ \text{Cost per serving} = \frac{\text{Total Cost}}{\text{Number of servings}} = \frac{18}{3} = 6 \]
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For 10 servings: \[ \text{Cost per serving} = \frac{\text{Total Cost}}{\text{Number of servings}} = \frac{60}{10} = 6 \]
In both cases, the cost per serving is consistent.
Thus, the cost per serving is: \[ \text{$}6 \text{ per serving} \]