C#: Storing percentages, 50 or 0.50?

Question

When holding percentage values in variables is there a preference between holding them as whole numbers vs fractions. That is should the variable hold numbers between 0 and 100

Answer 1

I would be inclined to store them as 0 to 1, then there is no conversion required when using the number in a calculation.

Using a number between 0 and 100 is more of a display / readability way of looking at the number. When you are displaying the percentage you can use String.Format("{0:P},percentage) which will expect the number to be between 0 and 1 but will display as 0 to 100.