 Walgreens finalizing a plan to fix its business that could result in the closure of hundreds of additional stores in the next three years. CEO Tim Wentworth says changes are imminent for about 25% of the company's stores, which he claims are underperforming. The drugstore chain currently runs more than 8,600 stores in the United States. Wentworth says the company's plan could include the closing of a significant portion of the affected 2,100 stores.