The original area of a rectangular vegetable field is 30.5 square meters. Now the length is increased by 5 times and the width is increased by 4 times. What is the area of this vegetable field in square meters now?
一块长方形菜地原来的面积是30.5平方米，现在把长扩大5倍，把宽扩大4倍，现在这块菜地的面积是多少平方米．
<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<gadget id="calculator">30.5 * 20</gadget>
<output>610</output>

<result>610</result>