In a multiplication expression, if one factor is multiplied by 10 and the other factor is divided by 100, the product obtained now is 3.6 less than the original product, what is the original product.
在一个乘法算式，如果把一个因数乘以10，另一个因数除以100，则现在所得的乘积比原来的乘积少3.6，则原来的乘积是多少．
<gadget id="calculator">3.6 / 9</gadget>
<output>0.4</output>

<gadget id="calculator">0.4 * 10</gadget>
<output>4</output>

<result>4</result>