The product of two factors is 42, one factor is multiplied by 4, and the other factor is multiplied by 2, what is the product?
两个因数的积是42，一个因数扩大4倍，另一个因数扩大2倍，积是多少．
<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<gadget id="calculator">42 * 8</gadget>
<output>336</output>

<result>336</result>