A man sells two houses for Rs. 24000 each. He maks 20% of the cost price on the first, but on the second he has a loss of 30% of the cost price. How much did he gain or loss by this transaction?
A.Rs. 1500 gain
B.Rs. 2000 loss
C.Rs. 2000 gain
D.Rs. 2500 loss
E.Rs. 2500 gain