Robichau Inc. reported the following results from last year's operations: Sales Variable expenses Contribution margin Fixed expenses Net operating income Average operating assets $6,300,000 4,930,000 1,370,000 803,000 $567,000 $3,000,000 5:20 ed At the beginning of this year, the company has a $900,000 investment opportunity with the following characteristics: $1,530,000 Sales Contribution margin ratio Fixed expenses 30% of sales $306,000 The company's minimum required rate of return is 20%. Last year's return on investment RO) was closest to