Hi, can someone please help me with my assignment:

A client has asked to help her understand how her tax is computed. You need to provide the client with the following:

• An example of how to calculate the tax liability using the tax rate table and the tax rate formula for a taxpayer with taxable income of $55,000, filing status married filing jointly.
• An explanation of the marginal tax rate and average tax rates for this tax payer.

Be clear in elaboration so the client, a person with no business or tax background, can understand.

Please provide tax rate table and references. Thank you!