In an oral English competition, 600 people participated. There are 30 first prizes, 50 second prizes, and 70 third prizes. What is the winning rate?
在一次英语口语比赛中，有600人参赛．一等奖30人，二等奖50人，三等奖70人，获奖率是多少？
<gadget id="calculator">30 + 50 + 70</gadget>
<output>150</output>

<gadget id="calculator">150 / 600</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>