A restaurant owner is trying to decide whether to stay open at lunchtime. She has far fewer customers at lunch than at dinner and the revenue she brings in from lunch covers her expenses to buy food and pay the staff, but not much more.
What should the restaurant owner do?

Explanation:

A restaurant owner should not close the restaurant over the lunchtime. He should only do that if he is sure that he won't have any customer over lunchtime but since he has fewer of them, she should open it.

Also, it is giving him the ability to pay for some of the expenses which is also good for the restaurant.

the third answer is correct.