A firm has an ROE of $4\%,$ a debt$-$to$-$equity ratio of $0\mathrm{.}9,$ and a tax rate of $35\%$ and pays an interest rate of $7\%$ on its debt. What is its operating ROA?

Note: Do not round intermediate calculations. Round your answer to $2$ decimal places.

ROA$=\_\_\_\_\_\_\%$