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Percentages are percentages - simple! The marketing people have not yet come up with "new improved" percentages.
The answer depends on what you are trying to do with the percentages.
Any graph can use percentages.
This is more complicated than it first appears. You cannot simply add percentages together - you need to know what they are percentages out of. So if you have x% being a out of b so that x = 100*a/b and y% being c out of d so that y = 100*c/d Then the sum of the percentages is 100*(a+c)/(b+d). The clearest way to see that you cannot simply add up the percentages is, if you get a 50% score in one exam and a 50% score in another, you do NOT get 100% in the two exams combined!
Yes, provided you consider fractions and percentages as ratios.Yes, provided you consider fractions and percentages as ratios.Yes, provided you consider fractions and percentages as ratios.Yes, provided you consider fractions and percentages as ratios.