In the autumn sports meeting, 40 students from Class 1 participated in the competition, and 10 students did not participate in the competition. What is the participation rate of this class?
秋季运动会上，六1班有40位同学参加了比赛，有10位同学没有参加比赛，这个班的参赛率是多少
<gadget id="calculator">40 + 10</gadget>
<output>50</output>

<gadget id="calculator">40 / 50</gadget>
<output>4/5 = around 0.8</output>

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

<gadget id="calculator">(4/5) * 1</gadget>
<output>4/5 = around 0.8</output>

<result>4/5 = around 0.8</result>