Payments received more than 45 days after the date on which they are due shall be considered delinquent and subject to a late payment charge of $25.00 or 2 percent of the total due, whichever is greater. Payments received more than 60 days after the date on which they are due shall be subject to a 1 1/2 percent interest charge per month, until final payment is made and interest shall be applied to the total unpaid balance, including the late payment charge and any accumulated interest. Any amount paid shall be credited when the payment is received in the Fresh Pear Committee or Processed Pear Committee office.