A dealer buys a wristwatch for Rs 225 and spends Rs 15 on its repairs. If he sells the same for Rs 300, find his profit percent.
Cost price of wrist watch = Rs.225
Cost of repairing = Rs.15
Total cost = Rs. 225+15 = Rs.240
Selling price of watch = Rs. 300
Gain = Rs. 300-240 = Rs.60
= 
7