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2016-03-15T16:11:19+05:30

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Mean = Sum . of Observation /  No . of Observation
Here,
Mean = Sum of Salary of 12 mens / 12
Sum of salary of 12 mens = Mean * 12
                                            =14500 * 12
                                            = 174000

New Mean = Sum of salary of first 12 mens + salary of new guy/ 13
                   = 174000 + 18400 / 13
                   = 192400 / 13
                   = Rs 14800

Answer 
New Mean Monthly Salary Now = Rs 14800

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2016-03-16T16:20:53+05:30

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*** Note: The unit of currency used in this answer is not rupees, but taka (the currency of Bangladesh, where I am from).

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SOLUTION -  
Given,

mean of 12 people salary = Tk. 14, 500
one more person salary = Tk. 18, 400

To find out, what is the total mean of 13 people?

mean of 12 employees' (monthly salary) 
Tk. 14, 500

Mean = Sum / Number
so, Sum = Number * Mean

sum of 12 employees' (monthly salary) = Tk. (
14, 500 × 12 )
                                                                          = Tk. 174, 000

sum of 13 employees' (monthly salary) = Tk. ( 174, 000 + 18, 400 )
                                                                          = Tk. 192, 400
 
net/new mean =  Tk. ( \frac{192, 400}{13}
                               = Tk. 14, 800  (ans.)

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