need the step by step process and answers.

A firm earns a profit margin of 3.8 percent on sales of $435 million and employs net operating assets of $165 million to do so. It considers adding another product line that will earn a 4.8 percent profit margin with an asset turnover of 2.3. What would be the effect on the firm's return on net operating assets of adding the new product line? Can not conclude Decrease Increase No effect