The sum of the minuend, the subtrahend and the difference is 100, and the ratio of the difference to the subtrahend is 1:4. What is the product of the minuend, the subtrahend and the difference.
被减数、减数与差的和是100，差与减数的比为1：4，被减数、减数与差的积是多少．
<gadget id="calculator">5 + 4 + 1</gadget>
<output>10</output>

<gadget id="calculator">5 / 10</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">100 * (1/2)</gadget>
<output>50</output>

<gadget id="calculator">4 / 10</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">100 * (2/5)</gadget>
<output>40</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">100 * (1/10)</gadget>
<output>10</output>

<gadget id="calculator">50 * 40 * 10</gadget>
<output>20_000</output>

<result>20_000</result>