What is 20% of 90 to 100?
90的20%是100的多少．
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/5) / 100</gadget>
<output>1/500 = around 0.002</output>

<gadget id="calculator">90 * (1/500)</gadget>
<output>9/50 = around 0.18</output>

<result>9/50 = around 0.18</result>