Move the decimal point of a decimal one bit to the left, and the decimal becomes 2.16. What was the original decimal?
把一个小数的小数点向左移动一位，这个小数就变成了2.16，这个小数原来是多少．
<gadget id="calculator">2.16 * 10</gadget>
<output>21.6</output>

<result>21.6</result>