In which section and which Act is the formula located to calculate income tax liability?Section $6-4$ of the Income Tax Assessment Act $1997($Cth$)$Section $6\mathrm{.}1$ of the Income Tax Assessment Act $1936($Cth$)$Section $4-10$ of the income Tax Assessment Act$1997($Cth$)$Section $4-10$ of the Income Tax Assessment Act $1936($Cth$)$