When Xiao Ming calculated a division formula, he left out the decimal point of a dividend with one decimal place. After dividing by 42, the quotient is 12. What is the dividend in the original formula?
小明在计算一道除法算式时，将一个有一位小数的被除数的小数点漏掉了，除以42以后是商12．原式中的被除数是多少？
<gadget id="calculator">42 / 10</gadget>
<output>21/5 = around 4.2</output>

<gadget id="calculator">12 * (21/5)</gadget>
<output>252/5 = around 50.4</output>

<result>252/5 = around 50.4</result>