Adding a percent sign to a number reduces the number by 29.7. What is the original number?
一个数添上百分号，这个数就减少了29.7，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">29.7 / (99/100)</gadget>
<output>30</output>

<result>30</result>