Kindly, provide the solutions for 1,3, and 4

Problems 3.1 Demand for an item is constant at 1,000 units a year. Unit cost is 50, reorder cost is 100, holding cost is 25 per cent of value a year and no shortages are allowed. Describe an optimal inventory policy for the item What order size will give a variable cost within 10 per cent of optimal? What is the cost if suppliers only make deliveries of 200 units? 2 A company is introducing a new item and it has forecast likely demand next year as between 100 and 130 units. The costs are uncertain, but the reorder cost is somewhere between $50 and $70, and the holding cost is between 20 per cent and 25 per cent of unit cost a year. If the unit cost is $200, what can you say about the order size? 3.3 Per Norstrom supplies computer systems to a warehouse in Rotterdam. He sells 16 systems a week. The cost of an average system is 5,000, while order administration costs and delivery from Malaysia cost 1,000. The lead time is around 4 weeks and holding costs are around 16 per cent a year. What policy would you recommend for Per? 3.4 Demand for an item is constant at 40 units a week, and the economic order quantity is calculated to be 100 units. What is the reorder level if lead time is constant at 4 weeks? What is the effect of adding some margin of safety and raising the reorder level by ten units? What happens if the lead time (a) falls to 2 weeks or (b) rises to 6 weeks