If the decimal point of a decimal is moved two places to the right, the resulting number is 9.9 greater than the original number. What is the original number?
一个小数的小数点向右移两位，所的得数比原数大9.9，原数是多少．
<gadget id="calculator">100 - 1</gadget>
<output>99</output>

<gadget id="calculator">9.9 / 99</gadget>
<output>0.1</output>

<result>0.1</result>