What was the percentage change in inventories between 2018 and 2019?
{"Purchased components": {"April 26, 2019": 8, "April 26,2018": 12}, "Finished goods": {"April 26, 2019": 123, "April 26,2018": 110}, "Inventories": {"April 26, 2019": 131, "April 26,2018": 122}}
inventories_2019 = df["Inventories"]["April 26, 2019"]
inventories_2018 = df["Inventories"]["April 26,2018"]
answer = (inventories_2019 - inventories_2018) / inventories_2018 * 100.0