Determine the tax liability, marginal tax rate and average tax rate in each of the following cases.

Determine the tax liability, marginal tax rate and average tax rate in each of the following cases. Use the Form 1040EZ tax tables to determine tax liability. single taxpayer, taxable income of $28,764: Liability=, Marginal =, Average=, Single taxpayer, taxable income of $55,392: Liability=, Marginal=, Average=?