Company ABC announced plans to acquire company XYZ. Before the announcement, ABC and XYZ were traded at HK$20 per share and HK$30 per share respectively. The pre-merger equity value of the XYZ was HK$30 million. If the projected synergies were HK$10 million, what is the maximum exchange ratio ABC could offer in a stock swap and still generate a positive NPV? (6 pts)