Problem 2 For the plastic bottle inventory problem above, find the amount of safety stock needed to provide service levels of 60%, 70%, 80%, 90%, 95%,99%, 99.5%, and 99.9%. Prepare a chart that plots the service level (on the vertical axis) as a function of the safety stock level (on the horizontal axis). (This will need to be entered as a scatter-plot or XY chart in Microsoft Excel, since the horizontal axis values are not evenly spaced.) What can you conclude from this chart about the marginal benefit of additional safety stock, as the safety stock level increases? Problem 2 For the plastic bottle inventory problem above, find the amount of safety stock needed to provide service levels of 60%, 70%, 80%, 90%, 95%,99%, 99.5%, and 99.9%. Prepare a chart that plots the service level (on the vertical axis) as a function of the safety stock level (on the horizontal axis). (This will need to be entered as a scatter-plot or XY chart in Microsoft Excel, since the horizontal axis values are not evenly spaced.) What can you conclude from this chart about the marginal benefit of additional safety stock, as the safety stock level increases