The product of two numbers is 150, one factor is enlarged to 4 times the original factor, and the other factor remains unchanged, what is the product.
两个数的积是150，一个因数扩大到原来的4倍，另一个因数不变，积是多少．
<gadget id="calculator">150 * 4</gadget>
<output>600</output>

<result>600</result>