Per Centum -

"Percent" (one word) is standard American English, while "per cent" (two words) is more common in British English. How to Pronounce Percent - Deep English

A percentage breaks down any quantity into 100 parts, making it a standardized metric for comparison. per centum

The phrase emerged from per centum (16th century), and its usage was heavily refined by Italian merchants, who frequently used "per cento" for calculating taxes, interest, and discounts. "Percent" (one word) is standard American English, while