Dudley works as a waiter at a restaurant and his employer requires him to eat his evening

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Question:

Dudley works as a waiter at a restaurant and his employer requires him to eat his evening meal at the restaurant in order to keep dinner breaks for employees as short as possible. Dudley is paid $20,000 in salary over the year, receives $6,000 in tips, and eats $4,000 in meals. What is his gross income?