What is the amount of zakat due on 21,000 Saudi Riyals, knowing that 9,000 Saudi Riyals of it is a debt, and is zakat obligatory on the money used to purchase the car, and is it permissible to give zakat to the needy married sister and the needy widowed maternal aunt in the questioner's country?

"Salary is not subject to zakat until it reaches the nisab of gold (85 grams) or silver (595 grams). After deducting debts, the remaining amount is subject to zakat if a hawl (one lunar year) has passed on it. What was spent on purchasing a car is not subject to zakat. It is recommended to distribute zakat within its own country, and it is not permissible to transfer it a masafat al-qasr (distance allowing for shortening of prayers) if there are eligible recipients in the country. It is permissible to give zakat to relatives if they are in a country not exceeding the masafat al-qasr, and they have a higher claim to the zakat, provided you are not obliged to support them financially."