A boy buys an old bicycle for Rs. 162 and spends Rs. 18 on its repairs before selling the bicycles for Rs. 207. Find his gain or loss percent.
The buying price of the old bicycle = Rs.162
Money spent on repairs = Rs. 18
Real C.P. of the bicycle= 162+18 = Rs.180
S.P. of the bicycle = Rs.207
Profit = S.P. – C.P. = 207 – 162 = Rs. 45