The product of two factors is 250. If one factor is multiplied by 20, the other factor is also multiplied by 10. What is the product?
两个因数的积是250，如果一个因数扩大20倍，另一个因数也扩大10倍，积是多少．
<gadget id="calculator">20 * 10</gadget>
<output>200</output>

<gadget id="calculator">250 * 200</gadget>
<output>50_000</output>

<result>50_000</result>