Over the past decade, a growing number of hospitals in greater Minnesota have consolidated into larger health systems. Now, a new report shows that those medical centers are doing very well financially. During 2010, hospitals in the Twin Cities reported net income of $450.9 million, a profit of 5.9 cents per dollar of net-patient revenue, according to a report being released Friday, March 30, by Allan Baumgarten, an independent healthcare analyst in St. Louis Park. Hospitals affiliated with six large health systems as well as a few other strong medical centers in greater Minnesota collectively reported $652.7 million in net income, Baumgarten said. That worked out to a 10.8 percent margin.