Question

ram sold 2 watches at ₹240 each, if he gets 20% profit on one and 20% loss on the other find the lossor profit % in whole deal

Answer 1

see solution here. I also have one shortcut for this type of questions.

Answer 2

At the same SP for 2 articles, with numerically equal values of 'profit' and 'loss', Overall transaction will result in loss.
loss=-(a^2)/100 %= -(20)^2/100 = 4% loss
[a=numerical value of {g%=l%} given in the ques]