If total cost of price of 2 watches is Rs 3660. By selling one at a loss of 12% and the other at a gain of 16% there is neither loss nor gain in the total. Find out the cost of each of the watches. 
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Dear student
Total cost of two watches=Rs3660Let the CP of first watch be Rs xCP of second watch=Rs(3660-x)Loss percentage of first watch=12%Therefore, SP of first watch=Rs100-loss%100×C.P=Rs100-12100×x=Rs88x100Profit percentage of second watch=16%Therefore, SP of second watch=Rs100+Profit%100×C.P=Rs100+16100×3660-x=Rs1161003660-xAccording to given condition,SP of first watch+SP of seond watch=Rs366088x100+1161003660-x=366088x+424560-116x=36600058560=28xx=2091.42SO, C.P of first watch=Rs2091.42CP of second watch=Rs3660-2091.42=Rs1568.58
Regards

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