There were 300 people participating in the singing competition, including 15 first prizes, 20 second prizes and 40 third prizes. What is the winning rate for this competition?
有300人参加歌咏比赛，其中有一等奖15人，二等奖20人，三等奖40人．这次比赛的获奖率是多少？
<gadget id="calculator">15 + 20 + 40</gadget>
<output>75</output>

<gadget id="calculator">75 / 300</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">100 / 100</gadget>
<output>1</output>

<gadget id="calculator">(1/4) * 1</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>