Williams Company adopted the dollar-value LIFO method on January 1, 2025, at which time its inventory consisted of 6,000 units of Item A @ $5.00 each and 3,000 units of Item B @ $16.00 each. The inventory at December 31, 2025 consisted of 12,000 units of Item A and 7,000 units of Item B. The most recent actual purchases related to these items were as follows: Quantity Items Purchase Date Purchased Cost Per Unit A 12/7/25 2,000 $ 6.00 A 12/11/25 10,000 5.75 B 12/15/25 7,000 17.00 Using the double-extension method, the price index for 2025 that should be computed by Williams Company . Which is it?