Explain how the Zhou discretionary family trust with the following particulars could distribute residual income to minimize tax at the end of the $2021$ income year, given the following:

$$ Taxable income of $$60,000$ at the end of the income year.

$$ A choice of three beneficiaries, all of whom could be made presently entitled to a portion of the income and are a resident of Australia for tax purposes:

$.$ Fred who is $45$ and has other taxable income of $$28,000.$

$.$ Samantha who is $20$ and has no other income.

$.$ Beth who is $16$ and has no other income.

When answering the question please consider relevant marginal rates and tax offsets.

$(8$ Points$)$

Why is the concept of present entitlement important?