When the accountant in the financial office of the school checked out the account, he found that there was an excess of 21.78 yuan on the account. Later, he found out that the decimal point of a sum of money was wrong.
学校财务室会计结账时，发现账面多出了21.78元，后来发现是把一笔钱的小数点点错了，原来这笔钱可能是多少．
<gadget id="calculator">21.78 / 9</gadget>
<output>2.42</output>

<result>2.42</result>