[libreoffice-users] filter bank transactions and then sum

I've got a spreadsheet of all my bank transactions and I want to filter 
them by type and them the results.

eg.
Tran Type Amount
1     A   1.5
2     B   2.0
3     A   3.5

I can use Data/More Filters/Standard Filer to get:
Tran Type Amount
1     A   1.5
3     A   3.5

but sum(C1:C3) gives 7.0 (the sum of the unfiltered spreadsheet.

I can copy but filtered rows but that is too easy. :-)
What is the hardest overkill way? :-)
Maybe a template or macro that I can reuse.
I just want to filter them so I can add up the interest I got.


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