Final answer:
To calculate the net operating working capital, subtract the non-operating current assets and non-operating current liabilities from the total current assets and total current liabilities respectively.
Step-by-step explanation:
To calculate the net operating working capital, we need to subtract the non-operating current assets and non-operating current liabilities from the total current assets and total current liabilities respectively. In this case, the non-operating current assets are the marketable securities and the non-operating current liabilities are the notes payable.
Therefore, the net operating working capital is calculated as follows:
Net Operating Working Capital = Total Current Assets - Non-operating Current Assets - Total Current Liabilities + Non-operating Current Liabilities
Net Operating Working Capital = $65 million - $5 million - $60 million + $30 million = $30 million
Therefore, the correct answer is b.$30 million.