The product of two factors is 0.5, if the two factors are multiplied by 4 at the same time, what is the product equal to?
两个因数的积是0.5，如果把两个因数同时扩大4倍，积等于多少．
<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<gadget id="calculator">0.5 * 16</gadget>
<output>8</output>

<result>8</result>