Answer :

Let the CP of watch be x

SP of watch = 720


Loss = 10% of CP


Also, Loss = CP – SP


10% of x = x – 720








CP of watch is Rs.800


Now for profit of 15%


Profit %




Profit = 120


SP of watch = CP + profit


= 800+120


= 920


Ravi should sell watch at Rs.920 to gain 15%.


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