You purchase $$,500$ worth of furniture with an interest free loan for $2$ years from the furniture company. If you pay all of the $$3,500$ back within two years then you will owe zero interest. If you do not pay back the entire balance, then you will owe the accumulated interest over $2$ years on the entire balance at $28\%$ per year. You forgot all about the deal and did not pay back the loan. After two years, how much interest have you accumulated?