A Single Point Urban Interchange moves more traffic through a smaller amount of space. Compare the Single Point to the Cloverleaf design, which takes up a much greater amount of land. The Single Point design makes it easier to build new interchanges within existing state property.
A cent is one hundredth of a dollar (in fact, the word cent is from a Latin word meaning hundred). So no, one tenth of a penny is not one hundredth of a dollar. 36 cents equals how many hundredths of dollars? 1 cent is 1 hundredth of a dollar so 36 cents are 36 hundredths of a dollar.
The word dollar is not unique to the United States, nor was it first used here. James VI of Scotland struck a 30-shilling coin between 1567 and 1571 generally called the Sword Dollar due to his depiction on the obverse holding a sword. The Double Merk of 1578 is called the Thistle Dollar.