All business income of each trade or business of the taxpayer shall be apportioned to this state by use of the apportionment formula set forth in K.S.A. 79-3279 and 79-4301, article IV.9. The elements of the apportionment formula are the property factor, the payroll factor and the sales factor of the trade or business of the taxpayer.
Kan. Admin. Regs. § 92-12-83