Dollar General stock plunged 27% on Thursday after the company released second quarter financial results that showed softening consumer demand and prompted a cut to its annual sales and profit forecast. The company's operating profit decreased by 20.6% to $550 million, while its diluted earnings per share fell 20.2$1.70. Its net sales for the quarter were $10.21 billion, shy of analysts' average estimate of$10.37 billion, according to LSEG data.The discount store operator and rival Dollar Tree have be ...