The sequence of categories -- Art, Binders, Paper and Phones -- in decreasing order of average processing time of their orders in this period is:
Explanation:
Let us calculate the average processing time for Arts: Total number of days = 20 Total no. of orders = 4 ∴ Average processing time for Art = 20/5 = 4 days
Similarly, Average processing time for Binders = 15/4 = 3.75 days Average processing time for Paper = 10/3 = 3.33 days Average processing time for Phones = 15/3 = 5 days
Decreasing order of average processing time is
Phones > Art > Binders > Paper.
Hence, option (a).
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