The product of two factors is 15.8. If one factor is multiplied by 5 and the other factor is multiplied by 2, what is the product of them?
两个因数的积是15.8，如果其中的一个因数扩大5倍，另一个因数扩大2倍，它们的积是多少．
<gadget id="calculator">15.8 * 10</gadget>
<output>158</output>

<result>158</result>