Annual demand $3200$, holding $\frac14\times6$: $Q^*=\sqrt{2\cdot3200\cdot150/1.5}=800$

If the half yearly demand of an item is 1600 units, inventory carrying charges 25% per annum, the unit cost is Rs. 6.00 and the cost of per order is Rs. 150, then the economic order quantity will be: