Subtract 25% of 1220 from 4 105, what is the difference?
从4个105里减去1220的25%，差是多少？
<gadget id="calculator">105 * 4</gadget>
<output>420</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1_220 * (1/4)</gadget>
<output>305</output>

<gadget id="calculator">420 - 305</gadget>
<output>115</output>

<result>115</result>