The decimal point of a two-digit decimal is moved to the right first, and the sum is 28.16 after being added to the original decimal. What is the original two-digit decimal?
一个两位小数的小数点先向右移动一位，在与原小数相加后和是28.16，原来的这个两位小数是多少．
<gadget id="calculator">1 + 10</gadget>
<output>11</output>

<gadget id="calculator">28.16 / 11</gadget>
<output>2.56</output>

<result>2.56</result>