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Option 4 : March, April, September and December

Total number of sold books over the years (January to December) = 2000 + 1500 + 2500 + 3000 + 2000 + 1000 + 1500 + 2000 + 5000 + 2000 + 150 + 6000 = 28650

Required average = 28650/12 = 2387.5

In March, April, September and December he sold the more books than average sold books.

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