15. Given the following information, calculate the companys Net Working Capital for the period: Cash of $250 mm, accounts receivable of $150 mm, inventory of $75 mm and property, plant and equipment (PPE) of $425 mm. The company also had long term debt of $325 mm, short term debt of $75 mm, accounts payable of $115 mm and other current liabilities of $65 mm. a. $220 mm b. $545 mm c. $20 mm d. $320 mm