A married man, with one child aged 19 years who is attending college, earns $36,720 per annum. He has a dependent relative whom he helps to support. If he also gets an allowance of $250 for National Insurance. Calculate: (a)Tax free allowance, (b)The taxable income, (c)the amount he pays in income tax per annum when this is charged at 20%, (d)His net income.