Is that before or after allowing for rent, travel, food? It's a different game of your parents are providing room and board. 50% of income is gone on the 3/4 basics.
Like I said, I started doing it at 15 so didn't have many out goings apart from new Xbox games
It would be hard doing that today but it worked for me. Saved my first deposit that way.
You've just got to save as much as you can.