Two articles are bought at the same price. One is sold at 20% profit and the other is sold at 10% loss. The overall profit/loss percentage is:

5% profit

Let the cost price of two article = 100 for each

There is a profit 20% on first so ,

The selling price of the first = 120% of 100 = 120

and 10% loss on second 

Then the selling prices of second article is = 90% of 100 = 90

Total CP : Total SP = 200 : 210

Profit% = ( 210 - 200 ) × \(\frac{100}{200}\) = 5%