Fifty points at ordinary times and fifty points at the end of the term.

Usually the total score is 100. 50% of the final grade. Why are you absent from class and didn't hand in your homework? Maybe your grade is only 70 homework, 70*50%=35 points, and 60 points at the end of the term have been calculated. It means that you still need 25 points and your final grade is 50%. So 25/50%=50 points. In other words, if your usual score is 70 points, you will get 50 points at the end of the term. In short, your final grade and your usual grade add up to 120. Our school usually only accounts for 30%.