7-5-2307. Treatment of rental-purchase contracts. Every contract entered into for the rental of machinery, equipment, apparatus, appliances, materials, or supplies of any kind which shall provide for payment of rental by the county and that, after a certain fixed amount has been paid as rental, the property shall become the property of the county or any other similar provisions or conditions shall be deemed and construed to be a contract for sale of such property, and all of the provisions of this part shall apply thereto and govern and control the same.