What is the formula for grading on a 100 percent scale?

There isn't one single formula for grading on a 100% scale. The formula depends entirely on how the points are assigned in the course. However, the general principle is:

Grade (%) = (Total Points Earned / Total Possible Points) * 100

For example:

* Total Points Earned: 85

* Total Possible Points: 100

Grade (%) = (85 / 100) * 100 = 85%

Different courses will weigh assignments differently. For example, a course might have:

* Homework (20% of grade)

* Midterm Exam (30% of grade)

* Final Exam (50% of grade)

In this case, you'd need to calculate the weighted average:

(Homework Score * 0.20) + (Midterm Score * 0.30) + (Final Score * 0.50) = Final Grade (%)

So the "formula" is adaptable to the specific weighting scheme of the course. You always need the points earned and the total possible points, but how those points are combined depends on the course's grading system.