根绝文章回答问题

根绝文章回答问题
A man goes to a fasr-food restaurant for lunch."Hi",an assistant says,"May I help you?""Id like a hanburger,large fries,and a medium Coke."the man says."Anything else?"the assistant asks."No" the man answers."Is that to eat in or to take away?"The assistant asks,"To take away."the man says.
The man pays for his lunch.The man's assistant puts a lunch in the bag,The man takes the bag."Thank you" The assistant says,"Have a nice day."
The man walks to a park.He sits down and opens the bag,He is surprise.There is no hamburger in the bag.There are no French fries.There is no Coke.There is money in the bag--a lot of money!The man counts the money.Two thousand dollars!
Why is the money in the bag?The man doesn't know.Can you guess?
Why is the money in the bag?