Zakah of a company that sells cars on installments

Question:
The question concerns a company with a capital of one billion riyals. It uses this capital to buy cars, which are then sold on installments. The money received from these installments is used to buy more cars, which are also sold on installments, some over one year, some over two, and some over three years. Is there any zakah on this? And how is its zakah paid? Is the zakah due on

Answer:
and its profits? Whenever the lunar year (hawl) is completed, they must pay zakah on the cars and cash they possess. The cars are valued at their market price at the end of the year, the cash is added to this value, and zakah is paid on the total. If they have not yet received the full price, zakah is still due based on the completion of the lunar year.