4. (1) This section applies to a designated area that consists of two or more local municipalities.  O. Reg. 129/99, s. 4 (1); O. Reg. 256/00, s. 1 (1). (2) Subject to subsections (3) and (4), the costs associated with the provision of land ambulance services in the designated area shall be apportioned among its municipalities as follows: 1. When the assessment rolls of the municipalities are returned to the clerk under section 36 of the Assessment Act, they shall also be provided to the delivery agent. 2. Each municipality shall provide the delivery agent with a copy of its by-law setting its tax ratios on or before the date it is required under section 363 of the Municipal Act to make the by-law. 3. The delivery agent shall determine, for each municipality, the amount to be apportioned to the municipality in accordance with the following formula:  where, A = the amount to be apportioned to the municipality, B = the costs associated with the provision of land ambulance services in the designated area, C = the sum of the weighted assessments for all of the properties in the municipality, D = the sum of the weighted assessments for all of the properties in the designated area. O. Reg. 129/99, s. 4 (2). (3) If the delivery agent for the designated area is not a board, (a) the municipalities in the designated area may enter into an agreement reapportioning among themselves the share of the costs apportioned to them under subsection (2); and (b) each municipality in the designated area shall pay its share of the costs to the delivery agent.  O. Reg. 129/99, s. 4 (3). (4) If the delivery agent for the designated area is a board, the board shall apportion the costs associated with the provision of land ambulance services in the designated area in a way other than that provided in subsection (2) if, (a) a majority of the municipalities in the designated area consent to that apportionment; and (b) those municipalities that have consented represent a majority of the electors in the board’s district.  O. Reg. 129/99, s. 4 (4). (5) Each of the municipalities included in the designated area is entitled to one vote under clause (4) (a).  O. Reg. 129/99, s. 4 (5). (6) A resolution of the municipal council is required for a municipality to consent under subsection (4).  O. Reg. 129/99, s. 4 (6). (6.1) Despite subsections (2) and (4), for the period beginning on December 11, 2017 and ending on December 31, 2019, if the delivery agent for the designated area is a board, the board shall use the method for the apportionment of costs associated with the provision of land ambulance services in the designated area that the board was using on December 10, 2017. O. Reg. 474/17, s. 1; O. Reg. 521/18, s. 1. (7) Each municipality in a designated area shall pay the delivery agent the apportioned amount on demand.  O. Reg. 256/00, s. 1 (2). (8) If the delivery agent for the designated area is not a board and a municipality fails to pay its apportioned amount to the delivery agent in accordance with subsection (7), the delivery agent may charge the municipality interest on the amount due at a rate to be set by the delivery agent and the municipality shall pay the interest.  O. Reg. 256/00, s. 1 (2). (9) If the delivery agent for the designated area is a board, the rate of interest that may be charged by the board under the District Social Services Administration Boards Act if a municipality fails to pay an apportioned amount shall not exceed 1 per cent per month.  O. Reg. 256/00, s. 1 (2). (10) A delivery agent shall give a municipality prior written notice of the day on which interest begins to accrue and of the interest rate.  O. Reg. 256/00, s. 1 (2). (11) Subsections (7), (8) and (10) do not apply if the delivery agent is the Ministry.  O. Reg. 256/00, s. 1 (2).