Robichau inc. reported the following results from last year’s operations: sales $ 6,300,000 variable expenses 4,930,000 contribution margin 1,370,000 fixed expenses 803,000 net operating income $ 567,000 average operating assets $ 3,000,000 at the beginning of this year, the company has a $900,000 investment opportunity with the following characteristics: sales $ 1,530,000 contribution margin ratio 30 % of sales fixed expenses $ 306,000 the company’s minimum required rate of return is 20%. last year's residual income was closest to: