Xiaoming’s electricity bill in October is 240 yuan, which is twice that of September. How much more is the electricity bill in October than in September?
小明家十月份电费为240元，是九月份的2倍，十月份的电费比九月份多多少元？
<gadget id="calculator">240 / 2</gadget>
<output>120</output>

<gadget id="calculator">240 - 120</gadget>
<output>120</output>

<result>120</result>