Taxation Law Question

Hi tutor, I need a specific explanation and calculation to follow HIRAC rules to answer this question.

Tutorial Question for Week 6 John, a full time tax consultant, derived salary of $120,000 in this income year. He purchased 1,000 shares in Woolworths for $18,000 in 2003, 500 shares in Westpac Bank for $20,000 in 2007, and 1,000 shares in BHP for $30,000 in January 2020. In March 2020, he sold all the shares in Woolworths for $32,000, Westpac for $15,000, and BHP for $38,000. Assuming no other income, calculate John's total assessable income for the income year. Tutorial Question for Week 6 John, a full time tax consultant, derived salary of $120,000 in this income year. He purchased 1,000 shares in Woolworths for $18,000 in 2003, 500 shares in Westpac Bank for $20,000 in 2007, and 1,000 shares in BHP for $30,000 in January 2020. In March 2020, he sold all the shares in Woolworths for $32,000, Westpac for $15,000, and BHP for $38,000. Assuming no other income, calculate John's total assessable income for the income year