Sec. 4. (a) If a county is required to pay for the maintenance and operation of municipal street lights under this chapter, the amount to be paid by the county shall be determined under this section.
(b) If the contract for the maintenance and operation of the lighting system calls for payment for the system as a whole, the county shall pay the amount that bears the same ratio to the total contract price as the number of lights to be paid for by the county bears to the total number of lights contracted for.
(c) If subsection (b) does not apply, the county shall pay the amount determined by multiplying the price paid by the municipality for the maintenance and operation of each light by the number of lights required to be paid for by the county.