Each problem is worth 10 points. The basic guidance to receive full credit is that the solution submitted must be understandable of and by itself to someone knowledgable in the subject without any need to consult the text of the problem or guess the calculation and reasoning.
Extra homework can be turned in during any class of the semester (the last class is April 23, 2019). Any problem in the Sakurai & Napolitano textbook that has not been assigned in the regular homework can be chosen as extra problem. Each problem submitted as extra homework is worth 10 points.
(For technical reasons, the total number of points available for Extra Homework in Canvas shows as 0.)