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The current erection cost of a structure is $Rs$. $13,200$. If the labour wages per day increase by $1/5$ of the current wages and the working hours decrease by $1/24$ of the current period, then the new cost of erection in $Rs$. is

  1. $16,500$
  2. $15,180$
  3. $11,000$
  4. $10,120$
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