Cost price of two articles is same. 1st is sold at 20% profit and 2nd is sold at 30% loss. Find overall profit or loss percentage in this transaction.

5% loss

Let CP of each article = Rs. 100

                     Profit   = 100 x 20% = 20

                       Loss   = 100 x 30% = -30

                  --------------------------------------

                      Overall profit/loss    =  -10

Required percentage =  \(\frac{10}{200}\) x 100 = 5%