Calculate minimum grade always sets the assignment grade to zero

[TotallyNotSethP]

Describe the bug

I downloaded this extension to see what score I needed on my final to get an A. To my dismay, I discovered that the "calculate minimum grade option" always set the assignment grade to zero, regardless of if this would keep the course grade within the inputted limit.

Steps to reproduce

• Go to "Grade Report"
• Click dropdowns to get to an assignment
• Click the three-dots, then click on Calculate Minimum Grade -> For A (90%)
• Notice that it changes the grade of the assignment to zero
• Repeat until your grade drops below 90%

Expected behavior

Your grade shouldn't be able to drop below 90%, since you just told it that limit

Screenshots

https://ibb.co/ZmHhVX9

Platform

Browser Name: Opera GX Browser Version: LVL3 (core: 82.0.4227.50) Schoology Plus Version: 7.3.5