In each of the following cases, compute the corporation's regular tax, average tax rate and marginal tax rate: Use $2017$ tax rate

schedule if needed.

Required:

a$.$ Silva Corporation has $$180,000$ taxable income for its tax year ended December $31,2017.$

b$.$ Goyal Corporation has $$180,000$ taxable income for its tax year ended December $31,2018.$

c$.$ Carver Corporation has $$180,000$ taxable income for its tax year ended October $31,2018.$

Note: For all requirements, Do not round intermediate calculations. Round your final answer to nearest whole dollar amount and

average tax rate answer to $2$ decimal places.