# By selling a watc

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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