Is Zakat to be given based on the Nisab of gold or silver, and is Zakat obligatory on an amount of EGP 17,000 deposited since May 2015 with no fixed income, and is the Zakat for stationery shop merchandise, valued at EGP 5,000, calculated separately upon reaching the Nisab, or is it added to the cash amount, and is the Nisab amount calculated based on the current gram price or its price at the time of deposit?

Zakat becomes obligatory upon the completion of a full year (hawl) on the wealth, and the considered hawl is the lunar year, not the Gregorian year. The zakatable threshold (nisab) for cash money and trade goods is estimated by what is most beneficial for the poor, whether it is the nisab of gold or silver. Trade goods are added to cash, and each complements the other's nisab. The determining factor in Zakat is the value of silver or gold at the time Zakat is disbursed.