Answer:
twice as much as when you were single
Explanation:
tax liability is calculated from subtracting all expenses from income. Assuming expenses also double, subtracting all expenses from income will result in tax liability twice as much as when you were single
Income initially= x
Income after increase= 2x
expenses initially= y
expenses after increase= 2x
tax liabiltiy initially= x-y
tax liabiltiy after increment= 2x-2y= 2(x-y)= 2× tax liability initially