Coin Value
cent 1 cent
nickel 5 cents
dime 10 cents
quarter 25 cents
dollar 100 cents
This is a function, because you can state unambiguosly the value of each coin.
The domain is the set of input values: { cent, nickel, dime, quarter, dollar}
The range is the set of output values: {1, 5, 10, 25, 100}