District firewardens and their helpers shall be paid at the following rates while fighting forest fires:
a. District firewardens, while engaged in fighting fires, two dollars for two hours or less, and fifty cents per hour thereafter; and, while otherwise employed, fifty cents per hour;
b. Helpers, fighting fire, one dollar for two hours or less, and forty cents per hour thereafter;
c. Helpers, on patrol or employed otherwise than fighting fire, forty cents per hour.