Both
Bills, coins and bank accounts
coins
Both coin an bills were used.
coins and 50 cent bills
11
800
Coins
Use numbers, instead.
Penny's (and other coins) are used to round out purchases that are made with bills.
Save some and use others to pay bills
Yes and no. You can use Canadian small change at stores but not the larger coins or bills.
The US Congress passed a law that ordered the US mint to issue these coins. The plan was to get people to use the one-dollar coins in place of the paper dollar bills and save millions in replacement costs. ( I do not know which Congressmen or senators pushed for the law.)