The amount of an * increasing adjustment that you have under Step 3 of the Method statement in section 129-40 for the thing acquired or imported is worked out as follows:
where:
"full input tax credit" is the amount of the input tax credit to which you would have been entitled for acquiring or importing the thing for the purpose of your * enterprise if:
(a) the acquisition or importation had been solely for a * creditable purpose; and
(b) in the case where the supply to you was a * taxable supply because of section 72-5 or 84-5--the supply had been or is a * taxable supply under section 9-5.