Provide the Missing Data in the Table

Provide the missing data in the table. (Round the answer to two decimal places.) $$\begin{array} { l r r r } & \text { Northern } & \text { Southern } & \text { Central } \\& \text { Division } & \text { Division } & \text { Division } \\\hline\text { Sales } & \$ ( \mathrm { a } ) & \$ 420,000 & \$ ( \mathrm {~g} ) \\\text { Operating assets } & \$ ( \mathrm {~b} ) & \$ ( \mathrm {~d} ) & \$ 750,000 \\\text { Net operating income } & \$ 850,000 & \$ 18,000 & \$ 270,000 \\\text { Margin } & 0.16 & ( \mathrm { e } ) & 0.18 \\\text { Turnover } & ( \mathrm { c } ) & ( \mathrm { f } ) & 2.00 \\\text { Return on investment } & 20 \% & 15 \% & ( \mathrm {~h} )\end{array}$$