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What is the correct answer?

4

A alone can do a piece of work in 6 days and B alone in 8 days. A and B undertook to do it for Rs. 3200. With the help of C, they completed the work in 3 days. How much is to be paid to C

A. Rs. 200

B. Rs. 400 

C. Rs. 600

D. Rs. 800

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