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Akhil and Nikhil together can complete a work in 9 days while Nikhil alone takes 12 days to complete 50% of the work. If the efficiency of Sachin is 20% more than that of Akhil, then find the time taken by Sachin alone to complete the whole work.

A 9 days

B 10 days

C 7 days

D 12 days

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