Final answer:
The new operating return on assets (ROA) for Salco after the plant's renovation will be 13%.
Step-by-step explanation:
The new operating return on assets (ROA) for Salco after the plant's renovation can be calculated using the formula:
ROA = Operating Profit Margin x Asset Turnover
Given that the operating profit margin will rise to 13% and the sales remain constant, the asset turnover can be calculated as the Total Assets divided by the Sales. However, since the sales remain constant, the asset turnover will also remain constant.
Therefore, the new operating return on assets for Salco after the plant's renovation will be 13%.