law: Workmen's Compensation Act, 1923 
  5. Method of
  
  calculating wages—
  In this Act and for
  
  the purposes thereof the expression “monthly wages” means the amount of wages
  
  deemed to be payable for a month’s service (whether the wages are payable by
  
  the month or by whatever other period or at piece rates), and calculated] as
  
  follows, namely:—
  a.     
  
    where
  
  the workman has, during a continuous period of not less than twelve months
  
  immediately preceding the accident, been in the service of the employer who is
  
  liable to pay compensation, the monthly wages of the workman shall be
  
  one-twelfth of the total wages which have fallen due for payment to him by the
  
  employer in the last twelve months of that period;
  b.    
  
    where
  
  the whole of the continuous period of service immediately preceding the
  
  accident during which the workman was in the service of the employer who is
  
  liable to pay the compensation was less than one month, the monthly wages of
  
  the workman shall be the average monthly amount which, during the twelve months
  
  immediately preceding the accident, was being earned by a workman employed on
  
  the same work by the same employer, or, if there was no workman so employed, by
  
  a workman employed on similar work in the same locality;]
  c.     
  
    in
  
  other cases [including cases in which it is not possible for want of necessary
  
  information to calculate the monthly wages under clause (b)]], the monthly
  
  wages shall be thirty times the total wages earned in respect of the last
  
  continuous period of service immediately preceding the accident from the
  
  employer who is liable to pay compensation, divided by the number of days
  
  comprising such period.
  Explanation.— A
  
  period of service shall, for the purposes of 8 [this section] be deemed to be
  
  continuous which has not been interrupted by a period of absence from work
  
  exceeding fourteen days.