The monitor of class 51 found that there was an extra 455.4 yuan in cash when he settled the class fee for this month. After checking the accounts, he found out that the decimal point of an expenditure was wrong, so how much is the actual expenditure?
五1班班长在结算本月班费时发现现金多了455.4元，查账之后得知，是一笔支出款的小数点看错了一位，那么这笔支出款实际是多少元？
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 - (1/10)</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">455.4 / (9/10)</gadget>
<output>506</output>

<result>506</result>