ما هي قيمة الزكاة في الشرع الإسلامي ؟
Zakat is based on income and the value of all of one's possessions. It is customarily 2.5% (or 1/40) of a Muslim's total savings and wealth above a minimum amount known as "nisab", but Islamic scholars differ on how much nisab is and other aspects of zakat. According to Islamic doctrine, the collected amount should be paid to the poor, the needy, Zakat collectors, those sympathetic to Islam, to free from slavery, for debt relief, "in the cause of Allah" and to benefit the stranded traveller. 
2.5% (or 1/40) of a Muslim's total savings and wealth above a minimum amount known as "nisab"