Spirits!? !
Oky Dokey - it would be "that much". Excise is currently charged at $83.84 per lite of alcohol plus GST. It will be more after August.
In that case and assuming three 1 litre bottles of Gin with 40% alcohol were purchased for NZD80 total with a NZD to AUD exchange rate of 0.93, then excise and GST payable would be calculated as follows:
% alcohol (by volume)
x Volume
x Rate
+ GST on excise
+ GST on Purchase (converted to AUD).
0.40
x 3
x $83.84
+ 0.1
x (0.40
x 3
x $83.84) + 0.1
x ($80.00
x 0.93)
or
AU$118.11
Excise rates for alcohol
Of course, if you reduce that to 2.25 litres (3 x 750ml) then nothing is payable.