### Exercise

Progress: an exercise is finished when either the correct answer is given, or when the solution is asked.

Score: each attempt starts with 100%. For every wrong answer 20% is deducted. When a solution is asked the score is 0%. We do not deduct points for hints. The score we show is the highest score of all finished attempts on an exercise.

`Example:`

If a student has finished an exercise three times, with scores 0%, 60% and 80%, then the mastery score is 80%.

### Package

Progress: the progress of a package is the number of exercises that are finished relative to the total number of exercises in a package.

`Example: `

When a student finished 2/10 exercises in a package, his progress is 20%

Score: The score per package is the average of all the highest scores per exercise that have at least one attempt.

### Subchapter

`Example:`

When a subchapter has 10 packages and a student finished one package and has a progress of 50% on another, his subchapter progress is 15%

Score: the score of a subchapter is the average of the scores of all packages in that subchapter that have at least one attempt.

`Example:`

When a subchapter has 10 packages and a student has attempted two packages with a score of 60% and 80%, his subchapter score is 70%

### Chapter

Progress: the progress of a chapter is the average of the progress of all sub chapters in that chapter.

`Example:`

When a chapter has 10 subchapters and a student finished one subchapter and has a progress of 50% on another, his chapter progress is 15%

Score: the score of a chapter is the average of the scores of all subchapters in that chapter that have at least one attempt.

`Example:`

When a chapter has 10 subchapters and a student has attempted two subchapters with a score of 60% and 80%, his chapter score is 70%