12. The C.P. of two watches taken together is Rs 840. By selling one at a profit of 16% and the other at a loss of 12%, there is no loss or gain in the whole transaction. Find the individual cost prices of the two watches.

12. The C.P. of two watches taken together is Rs 840. By selling one a

1.	12. The C.P. of two watches taken together is Rs 840. By selling one at a profit of 16% and the other at a loss of 12%, there is no loss or gain in the whole transaction. Find the individual cost prices of the two watches.
Answer» Let cost price of ONE WATCH be Rs. xCost price of second watch is Rs. (840 - X)Selling price of first watch = 116x/100Selling price of second watch = 88(840 - x)/100According to the question,840 = 116x/100 + 88(840 - x)/100Solving this we GET x = Rs. 360CP of first watch is Rs. 360 and second watch is 840 - 360 = Rs. 480