If the decimal point of a number is moved one place to the right, the resulting number is 8100 greater than the number, so what is the number?
一个数的小数点向右移动一位，所得到的数比这个数大8100，那么这个数是多少？
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">8_100 / 9</gadget>
<output>900</output>

<result>900</result>