(1) In the case of a rental, lease, or license of tangible personal property, the receipts from the sale are in Montana if and to the extent that the property is in Montana. If the property is mobile property that is located both within and without Montana during the period of the lease or other contract, the receipts assigned to Montana are the receipts from the contract period multiplied by the fraction computed under ARM 42.26.234(3) (as adjusted when necessary to reflect differences between usage during the contract period and usage during the taxable year).