Given the following data:

Average operating assets

Total liabilities

Sales

Contribution margin

Net operating income

Return on investment $($ROl$)$ is:

$ $2,976,000$

$ $342,240$

$ $1,488,000$

$ $833,280$

$ $148,800$

Multiple Choice

$28\mathrm{.}0\%$

$10\mathrm{.}0\%$

$56\mathrm{.}0\%$

$5\mathrm{.}0\%$