Compute the Profit Margin (Rounded to Nearest Percent)for the Tim

Multiple Choice

Compute the profit margin (rounded to nearest percent) for the Tim Tom investment center as shown below. $\begin{array}{lr}&\text { Tim Tom Subsidiary }\\\text { Total sales } & \$ 1,600 \\\text { Operating income } & \$ 180 \\\text { Average assets invested } & \$ 900 \\\text { Profit margin } & ? \\\text { Asset turnover } & ? \\\text { ROI } & ?\end{array}$

A) 7%
B) 9%
C) 12%
D) 18%