The product of two factors is 450. One of the factors is multiplied by 10 while the other remains unchanged. What is the product?
两个因数的积是450，其中一个因数乘10，另一个因数不变，积是多少．
<gadget id="calculator">450 * 10</gadget>
<output>4_500</output>

<result>4_500</result>