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we define the following
probability of accepting the sample = 10% =0.1
if tried, the probability of buying the sample=18% =0.18
Now, 10% will try the sample out of 600 samples which equals to 60 people.
Now, out of the 60 people defined above,18% will buy = (0.18*60)=10.8 sales
Thus, we conclude that he will make 10.8 sales