Sheffield Corp. has been using the LIFO method of inventory valuation for 10 years, since it began operations. Its 2020 ending Inventory was $62000, but it would have been $84500 If FIFO had been used. Thus, IF FIFO had been used, Shetheld's income before Income taes would have been $22500 greater in 2020. $22500 greater over the 10-year period. $22500 less in 2020 $22500 less over the 10 year period