A shopkeeper sells two articles at Rs.1000 each, making a profit of 20% on the first article and a loss of 20% on the second article. Find the net profit or loss that he makes?

SP of first article = 1000

Profit = 20%

CP = $\frac{100}{100+P}\times SP$= 5000/6 = 2500/3

SP of second article = 1000

Loss = 20%

CP = $\frac{100}{100-L}\times SP$= 5000/4 = 1250

Total SP = 2000

Total CP = $\frac{2500}{3}$+ 1250 = 6250/3

CP is more than SP, he makes a loss.

Loss = CP-SP = (6250/3)- 2000 = 250/3

Loss Percent = $\frac{\frac{250}{3}}{\frac{6250}{3}}\times 100$= 4%