A fruit seller buys some oranges at the rate of 5 for Rs. 10 and an equal number more at 10 for Rs.20. He sells the whole lot at 15 for Rs. 30. What is his loss or gain per cent ?

A

Loss per cent $$1\frac{19}{81}$$%

B

Gain per cent $$1\frac{19}{81}$$%

C

No loss or no profit

D

Loss per cent 2%