A calculator
Cost a dish by hand.
Type what goes into one serve and what the packs cost. The page works out the cost of the serve, what is left of the board price after the GST you remit, and what a 50 cent lift would be worth. The same arithmetic TrueK applies to a supplier bill: ex-GST, a pack divided down once, nothing rounded until the total.
What goes into one serve
The pack as it appears on the bill, how many units the pack holds, and how many of those units one serve uses. Tick GST only if the supplier charges it on that line; most fresh food, milk, bread and coffee beans carry none.
$0.30 a serve
$0.68 a serve
$0.20 a serve