A bad penny is an idiom for something which is unpleasant or unwanted, especially something which appears at an undesirable time.
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zinc is 97.5% of the penny and copper is 2.5% of the penny
Penny is not a proper noun.
The plural form for penny is pennies or pence.
A penny earned is a penny saved means the money you save (and you don't spend) then it is earned. Because you don't waste it so it's practically saved.
That is Jimmy's penny.