You find a great deal for your house! The bank agrees to give you a 5 year loan where you...

You find a great deal for your house! The bank agrees to give you a 5 year loan where you only pay $100 a month, and at 0% interest. What can go wrong? However, when 5 years pass you realize you agreed to a balloon mortgage, and all the rest of that loan is due right now. How much do you need to pay for your final (60th) payment? Explain how you got your answer and your reasoning behind it. House price is $105,000

Is this a trick question? Or is the answer simply the amount paid for 59 payments minus the original price?