Final answer:
To calculate ROI for an investment center, include all assets, whether current, tangible, or intangible, to fully assess the investment's performance.
Step-by-step explanation:
When calculating the Return on Investment (ROI) for an investment center, it is typically most appropriate to include all assets, regardless of type, in the asset base. This approach allows for a comprehensive assessment of the investment's performance. Assets such as current assets, tangible assets like machinery or real estate, and even intangible assets such as intellectual property and goodwill should be considered. This ensures that all resources contributing to the generation of revenue and profits are accounted for when determining the ROI. Including a broad range of assets provides a more accurate measure of the center's efficiency and profitability.