How is the Zakat calculated on an amount of eleven thousand dollars received after seven years of work, what is the percentage that must be paid from it, and when is Zakat due on it?

If the savings are inaccessible, then zakat is obligatory on them for one year only, at a rate of 2.5% of the amount. However, if they are accessible, then zakat is obligatory for every past year since they reached the nisab (the value of 85 grams of gold).