Percentages are percentages - simple! The marketing people have not yet come up with "new improved" percentages.
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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.
To find x as a percentage of y, calculate 100*x/y.
It is 100*staff costs/total costs.
To calculate X, as a percentage of Y, divide (100*X) by Y.
You cannot since grade boundaries may be adjusted to accommodate differences between tests that are easier or harder.