Is zakat obligatory on a saved amount of 7,0 Euros, and is it necessary to pay the zakat for the past two years on it?

Zakat becomes obligatory on saved money when it reaches the nisab and a full year (hawl) has passed on it. The nisab is the equivalent of 85 grams of gold or 595 grams of silver. Zakat does not lapse with the passage of time; rather, it must be paid for past years because it is a right of others in the wealth. It is not permissible for a woman to travel for study without a mahram, nor to reside alone in a country where she does not feel safe from temptation (fitna) or assault.