By selling a radio for Rs. 950, a man loses 5%. What per cent shall he gain by selling it for Rs. 1040?
SP = Rs.950
Loss % = 5
= Rs.1000
New SP will be Rs.1040
Gain = SP - CP
= 1040 – 1000
= Rs.40
= (40 × 100) / 1000
= 4%