Sec. 3. (a) The applicable schedule of rates for calendar years before January 1, 2011, shall be determined by the ratio resulting when the balance in the fund as of the determination date is divided by the total payroll of all subject employers for the immediately preceding calendar year. Schedule A, B, C, or D, appearing on the line opposite the fund ratio in the schedule below, shall be applicable in determining and assigning each employer's contribution rate for the calendar year immediately following the determination date. For the purposes of this subsection, "total payroll" means total remuneration reported by all contributing employers as required by this article and does not include the total payroll of any employer who elected to become liable for payments in lieu of contributions (as defined in IC 22-4-2-32). For the purposes of this subsection, "subject employers" means those employers who are subject to contribution.