The boards of two or more school districts may contract to share levied taxes in all or a portion of their respective districts. The rate of taxes to be levied on any property in the joint taxing area or district is the rate of tax provided for in the contract, not exceeding any levy limitations under chapter 57-15. The auditor of each county in which all or a portion of a contracting district is located shall fix and levy taxes on that portion of the property which is described in the contract and is located in the county at the rate set by the contract.