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Hey Pam, since you never mentioned which form you're working on, I'll just assume you're referring to the UPDATE/CALCULATE FIELD option for CONDITIONS.
If you wish to have a dollar sign prior to the calculated result, just type in the $ sign then press TAB on your keyboard before the computation. Here's a quick example showing a simple addition:
In case you're still having issues achieving this, please give us your form URL/ID so we can test and check from there.