How it works
Net worth is what you own minus what you owe. It is a snapshot of one day, and it changes.
Mina lists what she owns: a bike worth 20 coins, 15 coins in her jar and books worth 5. Then she lists what she owes: 5 coins to Dad for a kite.
Owing a little is ordinary. What she owns minus what she owes is her net worth: 40 − 5 = 35 coins.
Saving makes net worth grow, and not everything holds its worth: an old bike's worth slowly falls. Net worth is not about being rich.