Gotta show my age - when I was a youth in Missouri, we had a plastic state coin called a mill - worth a tenth of a cent, and used to pay sales tax (there were also 5 mill pieces). They disappeared in about 1960, when sales tax went to two percent (retailers were required to collect a penny on odd amounts of 26-75 cents, IIRC).
Gotta show my age - when I was a youth in Missouri, we had a plastic state coin called a mill - worth a tenth of a cent, and used to pay sales tax (there were also 5 mill pieces). They disappeared in about 1960, when sales tax went to two percent (retailers were required to collect a penny on odd amounts of 26-75 cents, IIRC).