xistence of a duty is a question of law and depends on mixed considerations of logic, common sense, justice, policy, and precedent." Snyder v. Med. Sent Corp. of E. Wash., 145 Wn.2d 233, 35 P.3d 1158, 1162 (Wash. 2001). The "existence of a duty may be predicated upon statutory provisions or on common law principles."