Can you work out how the last 2 questions were answered? Thanks!

Use the tax rate table below to answer the following questions: Taxable Income Tax Rate 0-50,000 15% 50,001 - 75,000 25% 75,001 - 100,000 34% 100,001 - 335,000 39% Over 335,000 39% What is the marginal tax rate on $100,000 of income? 39% What is the marginal tax rate on $257,858 of income? 39% What is the total tax owed on income of $481,3807_$170.988.20 What is the total tax owed on income of $217,999?_$68,269.61 What is the average tax rate on income of $189,4017 30.16% What is the average tax rate on income of $355,174? 34.28%