I have seen the word "percentage" defined as "a number or rate that is expressed as a certain number of parts of something divided into 100 parts". It seems to follow that 50% means "50 parts of something which is divided into 100 parts". Does the word percentage implies that the whole is 100? Am I being redundant if I use the phrase "percentage of one hundred"?
Context: I am trying to state explicitly that a number provided to my software should be in the form of "50" for 50%, not "0.50" (which, to be consistent, I would refer to as a percentage of one). My usage is as follows:
Provide the minimum discount given to this customer as a percentage of one hundred (15 for 15%).