making a functional invoice

[Wendell]

Hello All,
The attached invoice is from Libre Office in Ubuntu.
I am trying to get the formulas into the GNU invoice to do the same 
calculations as in the attached.

Is there a way of amending the GNU invoice to do this? It calculates 
shipping costs and the various duty costs, including sales tax on 
everything.

Does anyone think that this is possible?

Thanks in advance,
Wendell
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