Add a decimal point to a four-digit number and add it to the original number. The sum is 1930.11. What is the four-digit number?
一个四位数，给它加上小数点后，再与原数相加，和是1930.11，这个四位数是多少．
<gadget id="calculator">100 + 1</gadget>
<output>101</output>

<gadget id="calculator">1_930.11 / 101</gadget>
<output>19.11</output>

<gadget id="calculator">19.11 * 100</gadget>
<output>1_911</output>

<result>1_911</result>