Xiaojun won 8 games, lost 4 games and tied 8 games in the Go game. What is Xiaojun's winning percentage?
小军在围棋赛中胜了8局，输了4局，平了8局．小军的胜率是几分之几？
<gadget id="calculator">8 + 4 + 8</gadget>
<output>20</output>

<gadget id="calculator">8 / 20</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>