(1 fruit) + (1 sweetstuff) = (1 nutrio bar)
Look at the auction to learn the price of (1 sweetstuff).
Look at the auction to learn the price of (1 nutrio bar).
Calculate:
(Price of 1 nutrio bar) - (price of 1 sweetstuff) = (price of 1 fruit).
Modifier:
Refining costs (~0,02 pec per PED refined)
Variable:
Profit (~ 0,5% - 5,0%, rip off profits not included)