There are 100 students in the sixth grade of a certain school who have passed the physical education standard test, and 20 of them failed to meet the standard. What is the rate of the standard.
某校六年级有100人进行体育达标检测，其中有20人没达标，达标率是多少．
<gadget id="calculator">100 - 20</gadget>
<output>80</output>

<gadget id="calculator">80 / 100</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>