You can put this solution on YOUR website!
If I have 405 points out of 585 points. What is my grade?
405/585 * 100
0.69 * 100
Your grade would then depend on whether the instructor is grading on a "curve" or on an "absolute" scale.
On an "absolute" scale, you would be getting a D.
So, let's hope your instructor is grading on a "curve". In this case, your grade would depend on how well the rest of the class did.