Smitty$$s Finger$-$Licking BBQ has a total assets turnover equal to $2\mathrm{.}0,$ a return on equity $($ROE$)$ equal to $15$ percent, and a debt ratio equal to $60$ percent. If Smitty$$s is financed with debt and common stock, what are its $($a$)$ return on assets $($ROA$)$ and $($b$)$ net profit margin?