Property rented by the taxpayer is valued at eight times the net annual rental rate.
The payroll factor is a fraction, the numerator of which is the total amount paid in this state during the tax period by the taxpayer for compensation and the denominator of which is the total compensation paid everywhere during the tax period. The term 'compensation' means wages, salaries, commissions, and any other form of remuneration paid to employees for personal services. Payments made to an independent contractor or any other person not properly classified as an employee are excluded. The gross receipts factor is a fraction, the numerator of which is the total gross receipts from business done within this state during the tax period and the denominator of which is the total gross receipts from business done everywhere during the tax period. For the purposes of this subparagraph, receipts shall be deemed to have been derived from business done within this state only if the receipts are received from products shipped to customers in this state or products delivered within this state to customers.