The school organized a parent-teacher meeting, 40 people attended, and 10 parents were unable to attend due to other reasons. What is the attendance rate of the parents at the parent-teacher meeting?
学校组织开家长会，出席了40位，有10位家长因事无法参加，家长会上家长的出席率是多少
<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>