give me just the answer: The function f ( x ) gives the income tax paid on x dollars of taxable income: f ( x ) = 0.20 x if 0 x 15000 0.25 ( x 15000 ) + 3000 if 15000 x 45000 0.35 ( x 45000 ) + 10500 if x > 45000 a) Find the income tax paid when the taxable income is $ 42500 : $ b) Find the income tax paid when the taxable income is $ 79500