For the first $25,000, you are taxed at a rate of 10% so your tax for this part is $2,500. For the second $25,000, you are taxed at a rate of 20% so your tax for this part is $5,000. For the last $25,000, you are taxed at a rate of 30% so your tax for this part is $7,500. Your total income tax, combining the taxes from the three parts is $15,000.
