Discount store operator Dollar Tree forecast its second-quarter adjusted profit to be down as much as 50% from a year ago, accounting for volatility caused due to changing tariffs.Shares of the company were down about 3% in premarket trading.The Trump administration’s roller coaster tariff swings have thrown businesses into turmoil and unsettled consumers worldwide, who now brace for price hikes on everything from groceries to sneakers.Dollar Tree said on Wednesday that its second-quarter profit from contin ...