Answer:
Naomi can expect to pay $10,000 in taxes this year.
Explanation:
Proportional tax systems charge taxpayers by virtue of what they earn annually. It is an equitable system, since it charges the same percentage to all; but not equal, since each person pays a different amount according to their income range.
As in the example I make $20,000 a year and I pay $5,000 in taxes, the tax burden applied is 25%. Therefore, if my friend Naomi earns twice as much as me, that is, $ 40,000 a year, applying the same tax burden she should pay $10,000 in taxes.