Never worked it out at anytime.
I am a retailer keeping many small-small items.This includes different types of threads,naphthalene balls, plastic, aluminium &wooden hangers.Decoration lights.cClothes clips.Ribbons.Locks.Different types of flower pots, mud, wormi compost & cocopit.Mirrors.All mobile and all dish recharges.Still many small-small items which are difficult for me even to remember.