Trying to Maximize Yield per Cost #3

Some Winter Kush -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Set up cost (fixed costs) -Lamp: 40€ -Timer: 3,5€ -Pot: 4€ -Total fixed costs: 47,5€ Given 5 years (or 15 grows) usage time translates to around 3,17€ per grow in materials. Variable costs: -Seed: free (out of my previous grow) -Soil: 6€ -Fertilizer: 3,50€ -Power (100 days 20h/day): ~28,8€ (exact figure after harvest) -Total variable costs: ~38,3€ -Total costs per grow: ~41,47€