One variety of sugar is scald for Rs. 3.20 per kg at a loss of 20% and another variety is sold for Rs. 6 per kg at a gain of 20%. If equal quantities of the two are mixed together and the mixture is sold at Rs. 5.40 per kg, what is the loss or gain percentage? `G a in\ 20 %` b. `Los s\ 20 %` c. No Profit,no loss d. none of these