idk ... multiple possibilites come to my mind:

* spreadsheet

if you are able to add (small) numbers all by yourself

* pen & paper

* a text-file

and some ideas - i never used this, but i think it has to be simple

* CSV

* JSON

with a small script to calculate the SUMs/generate the result - eg. awk, perl, python, javascript, php ... whatever floats your boat scriptlanguage-wise ;))

or - lets start some rants ;)

* XML

with an XSLT-transformation ;))

just my 0.02€