a) For calendar 2020, Zimu Corporation reported pre-tax income of $90,000. A recount of the company's inventory revealed that 2020 ending inventory was overstated by $12,000. What is Zimu's corrected pre-tax income for 2020? b) XYZ Co. uses FIFO under the periodic system to value its inventory. Inventory costs increased throughout 2020. Required: If each method below was instead used (versus FIFO periodic), state the effect on 2020 ending inventory and COGS (higher, lower, the same). Ending inventory COGS FIFO perpetual Weighted average periodic