Question: why are 100s called c notes?
Answer: C-note is a slang term for a $100 banknote in U.S. currency. The "C" in C-note refers to the Roman numeral for 100, which was printed on $100 bills, and it can also refer to a century. The term came to prominence in the 1920s and 1930s, and it was popularized in a number of gangster films.