"A finding of contributory negligence turns on a factual investigation whether the plaintiff contributed tohisorher own loss by failing to take reasonable care of his or her person or property. What is reasonable care depends on the circumstances of the case. In many cases, it may be proper for a plaintiff to rely on the defendant to perform its duty. But there is no absolute rule. The duties and responsibilities of the defendant are a variable factor in determining whether contributory negligence exists and, if so, to what degree. In some cases, the nature of the duty owed may exculpatethe plaintiff from a claim of contributory negligence; in other cases, the nature of the duty may reduce the plaintiffs share of responsibility for the damage suffered; and in yet other cases, the nature of the duty may not prevent a finding that the plaintiff failed to take reasonable care for the safety of his or her person or property. Contributory negligence focuses on theconductof the plaintiff. The duty owed by the defendant, although relevant, is one only of many factors that must be weighed in determining whether the plaintiff has so conducted itself thatitfailedtotake reasonable care for the safety of its person or property.'