During 2021, WMC Corporation discovered that its ending inventories reported on its financial statements were misstated by the following amounts: WMC uses the periodic inventory system and the FIFO cost method. Required: 1-a. Determine the effect of 2019 errors on retained earnings at January 1, 2021, before any adjustments. (Ignore income taxes.) 1-b. Determine the effect of 2020 errors on retained earnings at January 1,2021 , before any adjustments. (Ignore income taxes.) 2. Prepare a journal entry to correct the error in 2021. 3. Will WMC account for the error (a) retrospectively or (b) prospectively? Determine the effect of 2019 errors on retained earnings at January 1,2021 , before any adjustments. (Ignore income taxes.) (If the answers is no effect then select "No effect" in the dropdown.) Determine the effect of 2020 errors on retained earnings at January 1,2021 , before any adjustments. (Ignore income taxes.) (If the answers is no effect then select "No effect" in the dropdown.) repare a journal entry to correct the error in 2021. (If no entry is required for a transaction/event, select "No journal entry required" in he first account field.) Journal entry worksheet Note: Enter debits before credits. Complete this question by entering your answers in the tabs below. Will WMC account for the error (a) retrospectively or (b) prospectively