The base of the parallelogram is increased by (2/5), and the height on the base is decreased by (1/4). How much does the area of the new parallelogram increase compared to the original one?
平行四边形的底增加(2/5)，底上的高减少(1/4)，新的平行四边形的面积比原来增加了多少．
<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

<result>1/20 = around 0.05</result>