Marigold Corp. recorded operating data for its shoe division for the year as follows:

Sales

$$810000$

Contribution margin

$123000$

Total fixed costs

$53000$

Average total operating assets

$500000$

What is the ROI for the year if management is able to identify a way to improve the contribution margin by $$40000,$ assuming fixed costs are held constant?

$21\%$

$14\%$

$22\%$

$19\%$