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股本回报率(杜邦模型)
$$\begin{aligned} \mathrm{ROE} &= \frac{\text{净收入}}{\text{净销售额}} \times \frac{\text{净销售额}}{\text{总资产}} \times \frac{\text{总资产}}{\text{总股本}} =\\ \\ &= \text{利润率} \times \text{总资产周转率} \times \text{财务杠杆}\\ \\ \\ \mathrm{ROA} &= \frac{\text{净收入}}{\text{净销售额}} \times \frac{\text{净销售额}}{\text{总资产}} =\\ \\ &= \text{利润率} \times \text{总资产周转率} \end{aligned}$$
$$\begin{aligned} \mathrm{ROE} &=\frac{54}{202}\times\frac{202}{1288}\times\frac{1288}{624}\\ \\ &=0.27\times0.16\times2.06\\ \\ &=8.65\%\\ \\ \\ \mathrm{ROA} &=\frac{54}{202}\times\frac{202}{1288}\\ \\ &=0.27\times0.16\\ \\ &=4.19\%\end{aligned}$$