To find the cost per serving, we can first calculate the cost per serving for both scenarios.
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For 3 servings at $18: \[ \text{Cost per serving} = \frac{18}{3} = 6 \text{ dollars per serving} \]
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For 10 servings at $60: \[ \text{Cost per serving} = \frac{60}{10} = 6 \text{ dollars per serving} \]
In both cases, the cost per serving is $6.
So, the answer is: $6 per serving