A number is reduced by 12.87 after adding a percent sign. What is this number?
一个数，添上百分号后减少了12.87，这个数是多少？
<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">12.87 / (99/100)</gadget>
<output>13</output>

<result>13</result>