Samson Co. announced its merger plans on October 25 and had a daily return of 0.7 percent. Thompson Co. announced its merger plans on October 26 and had a daily return of 0.4 percent. The Whitewood Co. announced its merger plans on October 27 and had a daily return of 0.6 percent. The daily market returns for October 25 through October 27 were 0.2, 0.3, and 0.4, respectively. What is the combined cumulative abnormal return for the announcement date?