(a) The Prosecuting Attorney of the Fourth Judicial District shall be furnished, by Washington County, suitable office space, telephone expenses, postage, printing, office supplies, and equipment.
(b)
(1) In addition, the prosecuting attorney shall be allowed two thousand five hundred dollars ($2,500) per annum as a contingent expense of his office for traveling expenses, special service, operation of automobiles, and such other expenses which, within the discretion of the prosecuting attorney, may be proper expenses of the office, and also including necessary expense in connection with any proper investigation incident to any criminal law violation or trials before any grand jury, or any court within the Fourth Judicial District, coming within the duties of his office.
(2) The contingent expense is to be paid by Washington County in an amount of two thousand three hundred dollars ($2,300) per year and Madison County in an amount of two hundred dollars ($200) per year from the general revenue fund. However, the annual amount shall be paid in equal monthly installments by each county.