On the day of October 10th at a railway station, there were 28 trains arriving on time, and the other 4 trains were late. Find the punctuality rate of the train that should arrive at the station on this day.
某火车站10月10日这一天，正点到站的火车有28列，另外4列火车晚点．求这天该到站火车的正点率．
<gadget id="calculator">28 + 4</gadget>
<output>32</output>

<gadget id="calculator">28 / 32</gadget>
<output>7/8 = around 0.875</output>

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

<gadget id="calculator">(7/8) * 1</gadget>
<output>7/8 = around 0.875</output>

<result>7/8 = around 0.875</result>