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The average salary of a group of 60 employees is Rs. 400. If 6 employees receiving an average salary of Rs. 450 leave the group and 4 new employees receiving an average salary of Rs. M join the group, then the average salary of the group increases by Rs. 50. Find the value of ‘M’.

A 1200

B 1800

C 1650

D 1250

E none of these

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