Cyberphone, a manufacturer of cell phone accessories, ended the current year with annual sales (at cost) of $72 million. During the year, the inventory of accessories turned over eight times. For the next year, Cyberphone plans to increase annual sales (at cost) by 25 percent. What is the increase in the average aggregate inventory value required if Cyberphone maintains the same inventory turnover during the next year? (Enter your response as an integer.)