The product of two numbers is 6.28. If one factor is expanded to 10 times the original factor and the other factor is reduced to the original (1/5), what is the product now?
两个数的积是6.28，如果一个因数扩大到原来的10倍，另一个因数缩小到原来的(1/5)，那么现在的积是多少？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">10 * (1/5)</gadget>
<output>2</output>

<gadget id="calculator">6.28 * 2</gadget>
<output>12.56</output>

<result>12.56</result>