What is a dollar?

A golden dollar coin is worth $1. It is made of a manganese-brass alloy. It features native American heroine Sacagawea on the front and a bald eagle on the back. Sub-units of a dollar: 100 pennies = $1, 1 nickel = 5 pennies = 1/20 dollar, 1 dime = 10 pennies or 2 nickels = 1/10 dollar, 1 quarter = 25 pennies or 5 nickels, 1 quarter = $0.25 = 1/4 dollar, 1 dime = $0.10 = 1/10 dollar, 1 penny = $0.01 = 1/100 dollar, 1 nickel = $0.05 = 1/20 dollar
