A 20-second advertisement is broadcast on TV once a day, and the total payment for one week of broadcast is 98,000 yuan. How much is the average per second?
电视上播放一条20秒的广告，每天播一次，播放一周共付人民币9.8万元，平均每秒多少万元？
<gadget id="calculator">20 * 7</gadget>
<output>140</output>

<gadget id="calculator">9.8 / 140</gadget>
<output>0.07</output>

<result>0.07</result>