When Xiao Ming did the multiplication, he forgot the decimal point of the multiplier 4.32, and the resulting product was 2138.4 larger than the correct answer. What is the correct answer?
小明在做乘法时，把乘数4.32的小数点给忘了，结果得到的乘积比正确答案大2138.4正确的答案是多少．
<gadget id="calculator">100 - 1</gadget>
<output>99</output>

<gadget id="calculator">2_138.4 / 99</gadget>
<output>21.6</output>

<result>21.6</result>