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Akhil and Nikhil together can complete a work in 12 days while Nikhil alone takes 18 days to complete 30% of the work. If the efficiency of Sachin is 25% more than that of Akhil, then find the time taken by Sachin alone to complete the whole work.

A 12 days

B 10 days

C 20 days

D 15 days

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