Deutsche Bank (DBKGn.DE) saw net profit fall by half to 559 million euros ($608.1 million) in the first quarter versus a year ago as hefty legal charges eroded gains from a 24 percent rise in revenue to a near record of 10.4 billion euros. The group’s investment bank saw revenue increase but its pre-tax contribution to the group’s bottom line fall by more than half to 643 million euros due to rising non-interest expenses.