$2)$ Describe the duties of a bailee and give an example of a bailment

where:

a$)$ The bailment is for the sole benefit of the bailor

b$)$ The bailment is for the sole benefit of the bailee

c$)$ There is a mutual benefit bailment

$3)$ Given the fact that generally one is innocent of any wrong doing until

proven guilty why does page $927$ provide that a court will PRESUME

bailee negligence?