Whatever is used for trading; selling and buying, cash, profit, and spreadable stocks, you must give 2.5% every lunar year on that.

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No, zakat ul Fitr is not meant to build the masjid.

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Yes in sha Allah your prayer is valid. You should not redo your prayer unless you have done something to invalidate it, otherwise you open the door to waswasa.http://islamqa.info/en/87749

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