The Costs page lets you set up a set of rules for Behmor thing to use to calculate a suggested selling price.

Fixed: A fixed amount added to each roast.
Markup: What percentage shall I mark up the roasted coffee? You will find markup here and on each individual coffee and blend. This number is placed into each coffee and blend when you add them and then you may adjust the markup individually for each item in your inventory.
Incremental: How much money should I add for each weight increment of coffee roasted?
Sell In: What unit of measure do you sell your coffee in?

If you're using this for real, it's important to accurately track both pre and post roast weights as RoasterThing needs both these numbers to come up with an accurate price recommendation.