Weed Selling Price
The config files can be found at zeros_weedfarm\lua\
The SellValue for a full block of weed is inside the Plants config

Things like how much weed defines a full block of weed is defined in the Jar config

The money can be increased by the THC Level of the sold weed, which is defined in the THC Config.

Also to mention you only get the extra money from zwf.config.THC.sellprice_influence
if the weedblocks THC is more or equal zwf.config.THC.Max

Also the final money you get is influenced also by the NPC depending on what Profit % he currently has, this can be defined in the NPC Config.

The formel for each weedblock is something like that, the npc buyrate is a value between 0.5 - 2 depending on your config
Earnings = PlantSellValue + (PlantSellValue * zwf.config.THC.sellprice_influence)
Earnings = Earnings * NPCBuyRate