2 tons of coal, 4% of it is transported each time, how many times can it be transported.
2吨煤，每次运走它的4%，多少次可以运完．
<gadget id="calculator">4 / 100</gadget>
<output>1/25 = around 0.04</output>

<gadget id="calculator">1 / (1/25)</gadget>
<output>25</output>

<result>25</result>