Given that the product of two factors is 500, if both factors are doubled, what is the product?
已知两个因数的积为500，如果两个因数都扩大为原来的2倍，则积为多少．
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">500 * 4</gadget>
<output>2_000</output>

<result>2_000</result>