4. The following is a simplified version of the actual California state tax tables, for married filing jointly taxable incomes up to $37,219. For 2017, a married filing jointly person whose taxable income is between $0-$15,699 is charged 1% in tax. A married filing jointly person whose taxable income is between $15,700-$37,219 is charged 1% of the first $15,699, and 2 % of the amount over $15,699. Write an piecewise-linear function to represent the CA state income tax for a married filing jointly taxpayer as a function of taxable income, for taxable incomes up to $37,219. Graph this function. Note that these are referred to as "tax brackets". The actual tax brackets for the state of CA in 2017 is given in the table below: