The following data represent the means for each treatment co…

The following data represent the means for each treatment condition in a two-factor experiment. Note that one mean is not given. Which value for the missing mean would most clearly result in an A × B interaction, as well as a simple main effect of factor A regarding those in condition B2?                                  B1                   B2 ​ A1 ​       50 ​       30 ​ A2 ​       60 ​        ? ​