Complete a two way table to calculate the totals
Happy Not Happy Total
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Model A 8 2 10
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Model B 16 9 25
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Total 24 11 35
Analysis
From that table is easy to see that those who were not happy, who are 11:
- 2 purchased model A, which is (2/11)*100 % ≈ 18.18% ,
- and 9 purchased model B, which (9/11)*100 % ≈ 81.82%.
Then, the answer to the question is:
Of those who were not happy with their purchase, about 18% purchased model A, and about 82% purchased model B.