(i) Given CP = Rs. 4000, gain = Rs. 40
Gain % = {(Gain/CP) x 100) %
= {(40/4000) x 100} %
= (0.01 x 100) %
Gain % = 1%
(ii) Given SP = Rs. 1272, loss = Rs. 328
Loss = CP – SP
Hence, CP = Loss+ SP
= Rs. 328 + Rs. 1272
= Rs. 1600
Loss % = {(Loss/CP) x 100} %
= {(328/1600) x 100%
Loss % = 20.5%
(iii) Given SP = Rs. 1820, gain = Rs. 420
Gain = SP – CP
CP = 1820 – 420
= Rs. 1400
Gain % = {(Gain/CP) x 100} %
= {(420/1400) x 100 %
Gain % = 30%