The product of two factors is 90. If one factor is doubled, the other factor will also be doubled. What is the product?
两个因数的积是90，一个因数扩大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">90 * 4</gadget>
<output>360</output>

<result>360</result>