If a corporation had 1000000 of Taxable Income per year over

If a corporation had $1,000,000 of Taxable Income per year over the past four years and has paid 40% in taxes on that taxable income for each of the past four years, but in the fifth year incurs a loss of $4,000,000, how much of the $4,000,000 can be carried back and how much can be carried forward if any? How much of a refund would the company get from taxes previously paid? Show work below and then show how much was carried back as a total here_______________, how much was carried forward, if any, here _________________, and the tax refund to be received here_______________ What is the marginal tax rate?___________% What is the average tax rate, show work?___________%