you have a lemonade stand. it costs $10 a day to rent the juicer. cups cost 50c ea. the lemonade in each cup costs 80c of ingredients and labor.
— el gato malo (@boriquagato) October 22, 2018
you sell lemonade for $1. anyone can see that doing that is a loser.
it costs $1.30 for cup and lemonade, you lose 30c a unit.