How does a bank make money ?

Answer 1

All of the employees dance at night clubs on weekends and donate their money to keep the banks open.

Answer 2

Lending money. Late fees.

Answer 3

By lending out money. They pay you like .1% in interest on money in your savings account to get you to deposit your money but charges you like 5% for a 5 year loan. You do the math. 

Answer 4

One way is they take the money people have entrusted them with and then invest that in companies and take the profits, they give you a tiny bit, that's your interest.