If a whole is divided into 100 parts, a "percentage" indicates how many of those parts make up the subset being discussed.
The core, simple formula for a percentage is per centum
Percentages over 100% (e.g., 200%) signify a whole plus an additional amount (2 times the original amount). Related Technical Terms Per Mille (‰): Parts per thousand (1 in 1,000). If a whole is divided into 100 parts,
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. per centum