Already having some insights into the local demand for electric cars from regression analysis in the previous step, Vinauto can now think about their production planning. Battery is one of the most important components to manufacture an electric car that Vinauto has to source from a third party. Given that each electric car requires 1 battery, you are asked to build an EOQ inventory model to estimate the optimal order quantity for battery to satisfy the forecasted demand for electric cars in the targeted foreign country in 2022. All the information you have: - Demand: 3000 units/year - Ordering cost: 1000 per order - Holding cost: 35 per unit per month - Purchase cost: 30 - The discount for purchasing is arranged as below: o Q < 100: no discount (100%) o 100 <= Q <= 299: 5% discount (95%) o 300 <= Q <=399: 10% discount (90%) o Q >= 400: 20% discount (80%)