A percentage breaks down any quantity into 100 parts, making it a standardized metric for comparison.
"Percent" (one word) is standard American English, while "per cent" (two words) is more common in British English. How to Pronounce Percent - Deep English per centum
If a whole is divided into 100 parts, a "percentage" indicates how many of those parts make up the subset being discussed. A percentage breaks down any quantity into 100
