( X 10) + ( X 1) = 12 dollars
( X 10) + ( X 1) = 23 dollars
( X 10) + ( X 1) = 34 dollars
( X 10) + ( X 1) = 45 dollars
( X 10) + ( X 1) = 56 dollars
( X 10) + ( X 1) = 67 dollars