300
It was not the norm to go to college during Jack's time. Although his family wanted him to stay at school, he had other plans. He worked in a cannery, jute mill, laundry, and power station before he was 14 years of age. Finally, he decided to be an oyster "pirate". Who lent Jack London $300 so he could buy a boat?
Jennie Prentiss. [The woman who raised him and was a great mother-figure for Jack.]