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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             (a) 16,500                                                           (b) 15,180

      (c) 11,000                                                           (d) 10.120

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