The number obtained after moving the decimal point of a decimal to the right by two places is 89.1 greater than the original number. What is the original number?
把一个小数的小数点向右移动两位后所得的数比原数大89.1，原来的这个小数是多少．
<gadget id="calculator">100 - 1</gadget>
<output>99</output>

<gadget id="calculator">89.1 / 99</gadget>
<output>0.9</output>

<result>0.9</result>