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Answer:

Rs.13500

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Step-by-step explanation:

Total salary of all the employees = 19 x 12,000 = Rs. 2,28,000

Salary of the manager = Rs. 42,000

Total salary =  2,28,000 + 42,000 = Rs. 2,70,000

Average salary = 2,70,000/20 = Rs.13,500