What is the product of the difference between the smallest five-digit number and the largest four-digit number multiplied by 0.05?
最小的五位数与最大的四位数的差乘0.05，积是多少．
<gadget id="calculator">10_000 - 9_999</gadget>
<output>1</output>

<gadget id="calculator">1 * 0.05</gadget>
<output>0.05</output>

<result>0.05</result>