There are 18 trains arriving on time at a railway station on National Day, and 2 other trains are late. What is the punctuality rate of this station on this day?
某火车站国庆节这天正点到站的火车有18列，另有2列火车晚点，这天该车站的正点率是多少．
<gadget id="calculator">18 + 2</gadget>
<output>20</output>

<gadget id="calculator">18 / 20</gadget>
<output>9/10 = around 0.9</output>

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

<gadget id="calculator">(9/10) * 1</gadget>
<output>9/10 = around 0.9</output>

<result>9/10 = around 0.9</result>