Proportional and NonProportional Relationships

Question

Michael earns $3.90 per hour server at a restaurant.In addition he earns a average of 18% tips on his food sales.Is the amount of money that he earns proportional to the number of hours he works?

Answer 1

Okay, so this is a common sense question.

 

He earns 18% tips on his food sales.  So, his tips are proportional to the amount of food he sells.

 

From what you know about the restaurant business, what would have to be true for his tips to be proportional to the amount of hours he works?

 

Do you think that situation (Michael's amount of food sales being the same every hour) is likely in a real restaurant?