 Shares of ManpowerGroup rose 1.6 in premarket trading Tuesday, after the provider of workforce services swung to a second-quarter profit that beat expectations, citing a strong rebound in demand for workforce solutions, and provided an upbeat outlook for the current quarter. Net income totaled 111.6 million, or 2.02 a share, after a loss of 64.4 million, or 1.11 a share, in the year-ago period. 