I want to know the answer to the following question:
What was the change in profit to Au Bon Marche after these changes?
All the background I'm provided with is that "In 1869 he built much larger building at 24 rue de Sèvres on the Left Bank, and enlarged the store again in 1872, with help from the engineering firm of Gustave Eiffel, creator of the Eiffel Tower.". Is that enough to answer the question?
Answer: no