How it works
Nico saved fifty pretend coins and wanted his first bank account. Opening one takes a grown-up, so Gran walked him to the Coin House and signed the form.
Four words to know: a deposit is coins in, a withdrawal is coins out, the balance is the coins in the account now, and a statement lists every change.
A year later came a pretend extra, two coins for every fifty, so the balance was fifty-two. Then Nico took out twelve for a gift, and the balance was forty.
The lock-code is a secret that only Nico and Gran know. Never tell it to anyone who asks.