evidence: Walmart unveiled over a hundred revamped stores on Monday that have been recalibrated to pull in more customers and keep them in stores for longer, too. [...] So Walmart said it re-opened 117 stores in 30 states at a cost of half a billion dollars to keep customers engaged and shopping throughout the store. Those stores are part of an ongoing $9 billion investment over the past two years to update more than 1,400 of its more than 4,500 stores nationwide. [...] While the photos released by the company may not appear to show a drastically different look for a typical Walmart store, the changes are being implemented at a time when Walmart is trying to rev up sales.