Unwanted Zeros Appears in Calculated Field Text Boxes

Hello,

I am preparing a form for our shipping department and I have it set up to calculate taxes, palletizing, etc and give a total.  At first, it was giving me numbers with a bunch of decimal places like $37.555555557778 so I set the format to number and 2 decimals.  It also makes an unwanted zero appear in that space even though no data has been entered yet.  How can I fix this?  I want my calculations to remain the same and for the numbers to only display 2 decimal places but I don't want the zero there because we sometimes have to fill out the form manually.  I have very little experience with java script, I read up on some things but they do not make any sense to me.  If there is a flat out formula you know that I can just copy and paste to the custom format box that achieves this, please just let me know.  I greatly appreciate any help and thank you for your time.  If this post is duplicated, I apologize, I think I posted it in the wrong area.