Comparative Calendar Year Financial Data for a Company Are Shown

Comparative calendar year financial data for a company are shown below:
$\begin{array}{|l|r|r|}\hline \text { Sales } & \$ 720,000 & \$ 607,500 \\\hline \text { Gross profit } & 270,000 & 224,800 \\\hline \text { Income before taxes } & 79,200 & 78,700 \\\hline \text { Net income } & 51,200 & 51,700 \\\hline\\\hline &\text { December 31, } & \text { December 31, } \\&2011 & 2010 \\\hline \text { Liabilities } & \$ 493,500 & \$ 452,500 \\\hline \text { Common stock }(\$ 12 \text { par }) & 180,000 & 180,000 \\\hline \text { Contributed capital in excess of par } & 135,000 & 135,000 \\\hline \text { Retained earnings } & \underline{204,000} & \underline{177,300} \\\hline \text { Total liabilities and equity } & \$ 1.012,500 & \$ 944,800\\\hline\end{array}$
Calculate:
(1)Return on total assets for 2011.
(2)Return on common stockholders' equity for 2011.