Exercise 8-20 Skysong Company has used the dollar-value LIFO method for inventory cost determination for many years. The following data were extracted from Skysong's records Ending Ending Price Inventory Inventory Index at Base at Dollar- PricesValue LIFO December 31, 2017 105 December 31, 2018? Calculate the index used for 2018 that yielded the above results. Index used for 2018 $92,670 97,670 $89,000