Each town, statutory city, or school district in this state, at any time having an estimated market value of all its taxable property of more than $105,000,000, and having a county fair located within its corporate limits, may pay part of the expense of improving the fairground to the treasurer of the county owning the fairground, not exceeding $10,000, as its governing body, by resolution, determines to be for the best interest of the political subdivision. The amounts paid to the county must be used solely to improve the fairground in the manner the county board determines to be for the best interest of the county.