Assume that you are given the following historical relationship between a firm's sales and its of inventory: Sales Inventory 1 $3,875.24 $3,471.67 2 $4,172.83 $3,685.94 3 $4,783.29 $4,125.47 4 $5,893.67 $4,924.94 $7,231.91 $5,888.48 Year Based on this data, and using regression analysis, determine the level of safety stocks that appears to hold. O $667.82 O $643.25 O $659.37 O $681.50 O $675.10