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To type a cent sign on a Mac, just press the option and 4 keys at the same time (option+4, aka option+$). Easy!
If the shortcut doesn't work in your app, you have a few options:
Other common money signs:
The euro is option+shift+2: €
The British pound sterling is option+3 (aka option+#, aka option+pound): £
The Japanese yen is option-y: ¥
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You might also need to know:
How to type a heart symbol on a Mac