The product of a multiplication expression is 50, if one factor remains unchanged, the other factor is multiplied by 2, what is the product.
一个乘法算式的积是50，如果一个因数不变，另一个因数乘2，积是多少．
<gadget id="calculator">50 * 2</gadget>
<output>100</output>

<result>100</result>