If one factor is multiplied by 4, the other factor will also be multiplied by 4, how many times the product will be multiplied.
一个因数扩大4倍，另一个因数也扩大4倍，积扩大多少倍．
<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<result>16</result>