Residential Committee A donated 2,400 yuan to the disaster area, 20% more than Residential Committee B. How much more than Residential Committee B?
甲居委会为灾区捐款2400元，比乙居委会多捐了20%，比乙居委会多捐款多少元？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">2_400 / (6/5)</gadget>
<output>2_000</output>

<gadget id="calculator">2_400 - 2_000</gadget>
<output>400</output>

<result>400</result>