After the decimal point of a decimal is moved to the right by 2 digits, 89.1 is added. What is this decimal?
一个小数的小数点向右移动2位后，增加了89.1，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>