Lemonade Game

The cost of one cup is 12 cents.
The variables include the weather and the mood of people passing by.
The constants are  the price of the lemons, sugar, cups, and ice cubes.
The perishables include lemons, sugar, and ice cubes.
From this game, I learned that my lemonade stand as a small child was most likely not profitable, at all. Also, apparently people walk around and buy lemonade even when it's raining. Actually making a profit selling lemonade is possible, but making a sustainable amount isn't possible.