Question:
At the time of calculating zakat on merchandise (like clothing etc.) will we use the cost price or the selling price?
Answer: حامدا ومصليا ومسلما
The selling price will be used.
(4/309 احسن الفتاوى)
And Allah Ta’aalaa knows best
(Hazrat Mufti) Ahmed Khanpuri (May Allah preserve him)
Mahmoodul Fataawaa (2/38)