Final answer:
The correct answer is option a. The percentage of current assets on a common-size balance sheet is 67.2%.
Step-by-step explanation:
A common-size balance sheet expresses each item as a percentage of total assets. To find the percentage of current assets on a common-size balance sheet, divide current assets by total assets and multiply by 100.
In this case, the current assets are $45m and the total assets and equity are $67m. So the percentage of current assets on the common-size balance sheet would be:
($45m / $67m) * 100 = 67.16%
Therefore, the correct answer is 67.2% (option A).