What is the Zakat due on an amount of 17,000 Saudi Riyals that has been held for a full year (hawl), knowing that its origin was 15,000 Saudi Riyals and the increase occurred after the passing of the hawl, and the money is saved in the bank and not for trade?

2.5% (a quarter of a tenth) of money that reaches the threshold (nisab (definition)) and on which a year has passed (hawl) must be paid as Zakat (definition). If the increase in the amount is due to usurious dealings from banks, then one must dispose of it and repent. However, if the increase is a profit from a legitimate Mudarabah (definition) (as in Islamic banks), then Zakat is paid on it along with the original amount. And if the increase is new money added by the owner, then Zakat is paid on it after a year has passed, and its Zakat may be paid in advance along with the rest of the money.