The factory used 2400 kwh of electricity in the past 2 days, and now it uses 700 kwh of electricity every day. How much less electricity is used now than in the past?
工厂过去2天用电2400度，现在每天用电700度，现在比过去每天少用电多少度？
<gadget id="calculator">2_400 / 2</gadget>
<output>1_200</output>

<gadget id="calculator">1_200 - 700</gadget>
<output>500</output>

<result>500</result>