WK Kellogg, the North American cereal business spun off from Kellogg, recorded lower-than-expected earnings and a fall in quarterly sales. The maker of Rice Krispies, Special K and Corn Flakes said sales fell 3.9% to $672 million, in line with analysts' projections, according to FactSet. Prices and product-mix changes lifted the top line, but were more-than offset by a decline in volumes that the company attributed to a difficult business environment.