Mr Tan, a shoe dealer, sells a pair of shoe for $30 at the cost of $20.
One customer bought a pair of shoe and paid $50 but Mr Tan did not have small change so he went to his neighbor and break it into smaller change.
After the client goes off getting the change and shoe, Mr Tan neighbor realized the $50 is fake and Mr Tan needs to pay back his neighbor.
Here comes the question, how much is Mr Tan's total loss?
This is a quiz to test how your business sense is, please explain how you arrive at your answer!