Surcharges and Penalties on Unpaid Taxes, Fees, or Charges. - The sanggunian may impose a surcharge not exceeding twenty-five (25%) of the amount of taxes, fees or charges not paid on time and an interest at the rate not exceeding two percent (2%) per month of the unpaid taxes, fees or charges including surcharges, until such amount is fully paid but in no case shall the total thirty-six (36%) mon