Is Zakat obligatory on the amount of 52,0 Riyals that has been deposited in the bank for over a year, being the price from selling a car that was purchased in installments for personal use, then dispensed with after obtaining another car from the workplace?

Whoever has a debt that consumes their wealth or reduces it below the nisab (minimum threshold) is not obligated to pay zakat. If the debt does not reduce the wealth below the nisab, then zakat should be paid on the remaining wealth after deducting the debt, upon the completion of a hawl (one lunar year). It is not permissible to make purchases through interest-based (usurious) banks, unless the sale is a murabaha (cost-plus financing) for the one who commands the purchase, in which case there is no issue, provided it adheres to the stipulated conditions of sale. This would typically occur with Islamic banks.