Final answer:
The sustainable growth rate formula is ROE * Retention Ratio. In this case, Exelon has an 18 percent ROE and a 40 percent retention ratio, resulting in a sustainable growth rate of 7.2 percent.
Step-by-step explanation:
The sustainable growth rate of a company can be calculated using the return on equity (ROE) and the retention ratio. The sustainable growth rate formula is:
Sustainable Growth Rate = ROE * Retention Ratio
In this case, the ROE is 18% (or 0.18) and the retention ratio is 40% (or 0.40). The sustainable growth rate formula is ROE * Retention Ratio. In this case, Exelon has an 18 percent ROE and a 40 percent retention ratio, resulting in a sustainable growth rate of 7.2 percent.
Therefore, the sustainable growth rate under constant debt/equity is:
Sustainable Growth Rate = 0.18 * 0.40 = 0.072 or 7.2%