Un pò di schemi per riassumere concetti che possono servirci nella vita di tutti i giorni...
https://i.servimg.com/u/f47/16/97/71/80/compra10.jpg
https://i.servimg.com/u/f47/16/97/71/80/costi10.jpg
https://i.servimg.com/u/f47/16/97/71/80/pesi10.jpg
https://i.servimg.com/u/f47/16/97/71/80/compra10.jpg
https://i.servimg.com/u/f47/16/97/71/80/costi10.jpg
https://i.servimg.com/u/f47/16/97/71/80/pesi10.jpg