whats my grade in percent if i got 13.24/20 points
To convert your score to a percentage, divide the obtained score by the total possible score and multiply by 100.
In this case, you got 13.24 out of 20 points:
Grade in percent = (13.24 / 20) * 100
Grade in percent = 0.662 * 100
Grade in percent = 66.2%
Therefore, your grade in percent is 66.2%.