I agree to pay interest at a rate of 1 ½% per month (18% per annum) for all unpaid past due invoices. I also agree to pay reasonable costs of collection, including attorney's fees, in the event of my failure to pay any unpaid balance. In consideration of the receipt of goods and services by said firm, the undersigned does contractually and personally guarantee all payments, interest and fees by said firm in the event of any collection of any unpaid balances. I have read and understand these terms set forth within this account application and fully agree to the terms and conditions.