Workers at nearly 80 King Soopers, owned by Kroger Co, approved a new three-year contract, the Colorado-based chain said on Tuesday, ending a stalemate that had caused a 10-day strike at the start of the year. King Soopers will invest $170 million in wage increases through the life of the agreement, with additional health-care investments. The union had planned to strike from Jan. 12 until early February for better wages and working conditions but called it off on Jan. 21 after reaching a tentative deal. Union President Kim Cordova said the deal followed several days of negotiations and the possibility of a sympathy strike by stores in California and Seattle. A document seen by Reuters showed per-hour raises ranged between $1.23 and $5.99 in the first year. The union said over 95 percent of the workers will get increases of $2 or more in the first year, with around 250 …