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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!

Q: How do you get a sum of two percentages?

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2 = 200%

maybe but I have never heard of such thing so i think you may have done the sum wrong.

24.5%+20.3%

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.

The sum of two and two is four.

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The sum of all percentages (in a circle graph or anywhere else) is 100%, which by definition is the totality of whatever it is that you are discussing.

The sum of the percentages in the percentage composition of a substance is always 100%. This represents the total proportion of the elements that make up the substance.

You can compare two values.

2 = 200%

just the basics. how to sum, multiply, percentages ... etc.

maybe but I have never heard of such thing so i think you may have done the sum wrong.

50%

24.5%+20.3%

You cannot calculate lengths to percentages. Percentages are comparisons of two related quantities so you can have one length as a percentage of another length, but not by itself.

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.

The sum of two and two is four.

10.115%. To find the average, add the 2 individual percentages together, then divide the sum by the number of original percentages in the equation. 7.98% + 12.25% = 20.23% 20.23% divided by 2 = 10.115%