The Washington Post has an excellent story and a few graphs on the cost of making money. Not earning money but the actual manufacture of currency and coinage.
Making a dollar bill is pretty profitable but making pennies and nickels is a money losing proposition.
Isn't is really time to let the penny go and become a historical footnote?
The cost of the metal bares much of the blame for the increased production costs.
The graph below shows how much it costs to produce $1.00 worth of each bill and coin.