For incomes that are more than €20,000, the tax is €2000 plus 50% of the amount over€20,000.
f(x) = 0.1 * x for x
f(x) = 2000+ 0.5 *(x-20000) for x > 20,000
x= y/10 for y <=2000
x= (y-2000)/0.5+20000 for y > 2000
f -1 (x) = x/10 for x < =2000
f -1 (x) = 20000+(x-2000)* 2 for x > 2000
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