STEP ONE: Multiply the number of days in the taxpayer's taxable year that precede the day the rate changed by the rate in effect before the rate change.
STEP TWO: Multiply the number of days in the taxpayer's taxable year that follow the day before the rate changed by the rate in effect after the rate change.
STEP THREE: Divide the sum of the amounts determined under STEPS ONE and TWO by the number of days in the taxpayer's tax period.
However, the rate determined under this subsection shall be rounded to the nearest one-hundredth of one percent (0.01%).
IC 6-3-2-1