A retail store in St. John's NL, which sells (among other things) one kind of USB sticks, knows that the annual demand for these USB sticks is constant at 6000 units/year at the selling price (to end customers) of $10/unit. These USB sticks are obtained only from one supplier, who charges a delivery fee of $70 for each order, regardless of the number of units delivered. The inventory holding cost rate is calculated based on 6 percent annual interest rate. The supplier charges $8/unit for 0 - 999 units ordered, but is willing to give a discount of 5% per unit for orders between 1000 - 1999 units and a discount of 10% per unit for orders of 2000 units and above. Which inventory control model should be used by the store manager to manage the inventory of this kind of USB sticks