After adding % to a number, it decreases by 49.5. What is the original number?
一个数添上%后就减少了49.5，这个数原来是多少？
<gadget id="calculator">1 / 100</gadget>
<output>1/100 = around 0.01</output>

<gadget id="calculator">1 - (1/100)</gadget>
<output>99/100 = around 0.99</output>

<gadget id="calculator">49.5 / (99/100)</gadget>
<output>50</output>

<result>50</result>