The accounting income of Grace Corporation and its taxable income for the years 2020 to 2023 are as follows: Year Accounting Income Taxable Income Tax Rate 2020 $460,000 $299,000 25% 2021 420,000 294,000 30% 2022 390,000 304,200 30% 2023 460,000 644,000 30% The change in the tax rate from 25% to 30% was not enacted until early in 2021. Accounting income for each year includes an expense of $40,000 that will never be deductible for tax purposes. The remainder of the difference between accounting income and taxable income in each period is due to one reversing difference for the depreciation of property, plant, and equipment. No deferred taxes existed at the beginning of 2020. Instructions a. Calculate the current and deferred tax expense or benefit for each of the four years. Also calculate the balance of the deferred tax balance sheet account at the end of each fiscal year from 2020 to 2023. b. Prepare journal entries to record income taxes in all four years. c. Prepare the bottom of the income statement for 2021, beginning with the line "Income before income tax."