What is the result of dividing the product of 25 and 4 by the difference of 500 and 400?
25与4的积被500与400的差除，结果是多少？
<gadget id="calculator">25 * 4</gadget>
<output>100</output>

<gadget id="calculator">500 - 400</gadget>
<output>100</output>

<gadget id="calculator">100 / 100</gadget>
<output>1</output>

<result>1</result>