Final answer:
The firm can maintain an 11.16% rate of growth while keeping a constant debt-equity ratio without external equity financing. This is calculated using the sustainable growth rate formula, which involves the retention ratio and return on equity.
Step-by-step explanation:
To determine the rate of growth a firm can maintain while keeping a constant debt-equity ratio without external equity financing, we use the concept of sustainable growth rate (SGR). The sustainable growth rate is the maximum rate of growth a firm can sustain without increasing financial leverage. It can be calculated using the formula:
SGR = Retention Ratio x Return on Equity (ROE)
Where Retention Ratio is the portion of net income that is not paid out as dividends, and Return on Equity is net income divided by equity. In this case, the retention ratio is:
(Net income - Dividends) / Net income = ($2,250 - $900) / $2,250 = 0.6
And the ROE is:
Net income / Equity = $2,250 / ($8,000 + $4,100) = $2,250 / $12,100 = 0.186
Thus, the SGR is:
0.6 x 0.186 = 0.1116 or 11.16%
This implies that the firm can maintain a growth rate of 11.16% with its current operations and dividend policy, as long as it does not increase its debt-equity ratio.