Krishna purchased a number of articles at ’10 for each and the same number for 14 each. He mixed them together and sold them for 13 each. Then his gain or loss percent is

A

Loss $$8\frac{1}{3}$$%

B

Gain $$8\frac{2}{3}$$%

C

Loss $$8\frac{2}{3}$$%

D

Gain $$8\frac{1}{3}$$%