Please help me with the following question. I got 115 for 2020 and 116 for 2021 for the indexes, and my answers are incorrect.

On January 1, 2020,WaterwayWholesalers Inc. adopted the dollar-value LIFO inventory method for income tax and external financial reporting purposes. However,Waterwaycontinued to use the FIFO inventory method for internal accounting and management purposes. In applying the LIFO method,Waterwayuses internal conversion price indexes and the multiple pools approach under which substantially identical inventory items are grouped into LIFO inventory pools. The following data were available for inventory pool no. 1, which comprises products A and B, for the 2 years following the adoption of LIFO.