If the base of a parallelogram is enlarged by 4 times and the height by 5 times, how many times will the area be enlarged?
平行四边形的底扩大4倍，高扩大5倍，则面积扩大多少倍．
<gadget id="calculator">4 * 5</gadget>
<output>20</output>

<result>20</result>