What is the Zakat due on an amount of $12,0 if it has been owned for less than a month after selling land?

The zakat amount is a quarter of a tenth (2.5%), and it is due on money under two conditions: reaching the nisab (minimum threshold), and the passing of a hawl (one lunar year).

If the land is not intended for trade, then zakat is not due on the amount until a hawl has passed for the owner. If it is intended for trade, then zakat is due on the amount after a hawl has passed on the original capital with which the land was purchased.