A shopkeeper sells one transistor for Rs. 840 at a gain of 20% and another for Rs. 960 at a loss of 4%. His total gain or loss percent is:
Select the correct option
A) 100/17% loss B) 100/17% gain C) 20/3% loss D) None of these E) Cannot be determined
Explanation :   Let the cost price of 1st transistor be Rs. x and the cost price of 2nd transistor be Rs. y   S.P. of 1st transistor at 20% profit = Rs. 840   =&gt; (x + 20% of x) = 840   =&gt; x*(120/100) = 840   =&gt; x = 700   S.P. of 2nd transistor at 4% loss = Rs. 960   =&gt; (y - 4% of y) = 960   =&gt; y*(96/100) = 960   =&gt; y = 1000   So, total C.P. = (x + y) = Rs. 1700   Total S.P. = 840 + 960= 
<gadget id="calculator">840 + 960</gadget>
<output>1_800</output>
1800   Profit= (S.P. - C.P.) = (1800 - 1700) = Rs. 100   % Profit = (100/1700∗100)% = 100/17 %   Answer : 100/17% gain
<result>B</result>
A shopkeeper sells one transistor for Rs. 840 at a gain of 20% and another for Rs. 960 at a loss of 4%. His total gain or loss percent is: