Amar can complete a work in 30 days and Raman can complete t

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Amar can complete a work in 30 days and Raman can complete the same work in 15 days. If both of them work together, then in 4 days what percent of the total work will be completed?

[2017 SSC CGL 12 AUG Shift 2]

A 15

B 37

C 40

D 45