3. The rent agreed upon by the parties is fixed at 13,000 ( Baht Thirteen Thousand only ) per month, payable in advance within the 25th-29th day of each month. Any late payment in all or a part of monthly rental/service fee shall be subjected to interest at 8% (8 percent) per month of monthly rental/service fee plus 1,000 baht/call administration fee counting from the original payment date until payment is received.