When two numbers are multiplied, the product is 80. If one factor is doubled, the other factor is also doubled. What is the product?
两个数相乘，积是80，如果一个因数扩大2倍，另一个因数也扩大2倍，积是多少．
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">80 * 4</gadget>
<output>320</output>

<result>320</result>