Price assumptions: sandwich and a milkshake - $10, train fare - $4.30, coffee - $3.60, school uniform - $85, avo on toast - $8, childcare for one day - $102, banana - 45 cents, university textbook - $160, beer - $6, netflix - $13.99 per month. Yes, these things can be more or less expensive - we've chosen a range of items and costs just for illustrative purposes. Tax cut figures from Treasury estimates.