To find the percentage of a grade, you divide the score by the total possible points and then multiply by 100. In this case, 420 out of 510 is approximately 82.35%. This indicates a strong performance, typically translating to a letter grade around a B or B+ depending on the grading scale used.
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510
dx
4203 = 420 x 420 x 420 = 74088000
21% of 420= 21% * 420= 0.21 * 420= 88.2