Anguiano Incorporated reported the following results from last year$$s operations:

Sales $ $10,500,000$

Variable expenses $8,210,000$

Contribution margin $2,290,000$

Fixed expenses $1,555,000$

Net operating income $ $735,000$

The company$$s average operating assets were $$5,000,000.$

Last year's return on investment $($ROI$)$ was closest to: