When a bus departs from the terminus, 12.5% of the seats on the bus are empty. When it arrives at the station, 8 people get off and 12 people get on the bus. At this time, all the seats on the bus are full. How many seats does this bus have?
一辆公交车从总站开出时车上有12.5%的座位空着，到站时，有8人下车，12人上车，这时车上座位全部坐满．这辆公交车共有多少个座位．
<gadget id="calculator">12 - 8</gadget>
<output>4</output>

<gadget id="calculator">12.5 / 100</gadget>
<output>0.125</output>

<gadget id="calculator">4 / 0.125</gadget>
<output>32</output>

<result>32</result>