Selected hypothetical comparative statement data for the giant bookseller Barnes & Noble are presented here. All balance sheet data are as of the end of the fiscal year $($in millions$).$

$\backslash$table$[[,2025,2024],[$Net sales,$$5,250\mathrm{.}5,$$$5,600\mathrm{.}7,],[$Cost of goods sold,$3,000\mathrm{.}0,3,800\mathrm{.}7,],[$Net income,$85\mathrm{.}3,160\mathrm{.}6,],[$Accounts receivable $($net$),75\mathrm{.}1,100\mathrm{.}0,],[$Inventory$,1,250\mathrm{.}1,1,350\mathrm{.}1,],[$Total assets,$2,850\mathrm{.}0,3,150\mathrm{.}0,],[$Total common stockholders' equity,$880\mathrm{.}0,1,100\mathrm{.}5,]]$

Compute the following ratios for $2025.($Round asset tumover to $2$ decimal places, eg $1\mathrm{.}83$ and all other answers to $1$ decimal place, eg$.1\mathrm{.}8$ or $2\mathrm{.}5\%)$

a$.$ Profit margin $\%$

b$.$ Asset turnover $$ times

c$.$ Return on assets $\%$