You cannot since grade boundaries may be adjusted to accommodate differences between tests that are easier or harder.
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you would find percentages in cooking sale prices grades
Percentages are percentages - simple! The marketing people have not yet come up with "new improved" percentages.
A:100%-93% b:92%-78%
You cannot calculate weights to percentages. Percentages are comparisons of two related quantities so you can have one weight as a percentage of another weight, but not by itself.
Are you talking about grades? There are several ways to do this. Ask the teacher how it is done.