To calculate the tip amount based on Sam's dinner bill:
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First, find 20% of the bill. The bill was $50, so you can calculate the tip as follows:
\[ \text{Tip} = \text{Bill} \times \text{Tip Percentage} \]
\[ \text{Tip} = 50 \times 0.20 = 10 \]
So, the tip amount is $10.