Sec. 13. (a) A member of the township legislative body who holds office for a fraction of any year is entitled to a proportionate fraction of the annual salary.
(b) A member of the township legislative body who holds office on December 31 of any year is entitled to the member's salary on that day.
(c) A member of the township legislative body who leaves office before December 31 of any year is entitled to the member's salary on the day the member leaves office.