(RTTNews) - UniFirst Corporation (UNF) said its fourth-quarter operating income rose 10.1% year-on-year. The company noted that, during the quarter, its margins were pressured by the current inflationary environment as well as a rebound of certain costs that trended lower during the pandemic. On average, five analysts polled by Thomson Reuters expected the company to report profit per share of $1.84, for the quarter.