plz help me this question

Look up Australia's resident tax rates for 2018-19 available on the Australian Taxation Ofce website. You will nd a table containing 5 tax rates depending on income. Please use the rates contained in the table to answer the following questions. (a) For someone earning AU$25,000 of taxable income, what is her marginal and average tax rate? (b) For someone earning AU$140,000 of taxable income, what is her marginal and aver- age tax rate? (c) For someone earning AU$2,000,000 of taxable income, what is her marginal and aver age tax rate? (d) What would have to be true about the taxable income of an Australian for her marginal and average tax rates to be the same? (e) Is the Australian income tax system progressive, at, or regressive? Is that true at ev ery taxableincome level? Tax rates 2018-19 Taxable income Tax on this income 0-$18,200 Nil $18,201-$37,000 19c for each $1 over $18,200 $37,001-$90,000 $3,572 plus 32.5c for each $1 over $37,000 $90,001-$180,000 $20,797 plus 37c for each $1 over $90,000 $180,001 and over $54,097 plus 45c for each $1 over $180,000