60% of all instructors who teach statistics for economics, received a sample of statistic textbooks from the board. 30% of the instructors, who received the sample textbook, adopted the sample materials in their lectures. In addition, 20% of the instructors, who do not receive the sample textbook, use this textbook in their classes.

Using this information, determine the probability that an instructor, who adopts the textbook, received the sample textbook.?