a child swallowed a small part from a toy and was injured as a result. the child was three years old, and the toy was made for children 10 and up. the box clearly stated that the toy was made for children 10 years old and up and also had warnings about how parents should always supervise their children when playing with the toy. the box also said the product was not to be swallowed. in this case, the child's parent was not supervising the three year old when he swallowed the toy part. as a result, the jury determines that the toy manufacturer (defendant) was 20 percent liable, but the majority of the liability rests with the parent who did not supervise the child. under which system of negligence can the plaintiff recover damages for the 20 percent liability of the company?