A company's ROA and ROE are constant as $7\%$ and $14\%$ respectively and these two variables are defined as net income dividend by the previous year's total assets and equity respectively. The company always pays out $40\%$ of its net income as dividend. What is the maximum growth rate in firm size $($total assets$)$ if the only source for asset growth is retained earnings $($please report the answer as a decimal number and keep THREE decimal places such as $0\mathrm{.}018)$