Dollar Tree ditched its single $1 price point years ago. Now, executives say, that's giving the retailer an advantage as it deals with tariffs. The discount chain said Wednesday that it would face an extra$70 million in tariff-related costs during its second quarter after a brief period this spring when it had to pay duties of 145% on some imports from China, CFO Stewart Glendinning said on the company's first-quarter earnings call.Those extra costs could send Dollar Tree's earnings per share between 45% ...