Stefan goes to a restaurant to eat dinner with his family. They order an appetizer that costs $10 and 4 entrees that are $20 each. If they tip 20% of the total for the waiter, what is the total amount of money that they spend at the restaurant?
Please answer the following question by reasoning step-by-step.
108
The total cost of the entrees is 4 * $20 = $80.

The total cost of the dinner is $80 + $10 = $90.

The tip is $90 * 0.

20 = $18.

The total cost with tip is $90 + $18 = $108.

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So, the final answer is 108