If the base and height of the parallelogram are increased by 10% respectively, how much will the area of the new parallelogram increase compared to the area of the original parallelogram?
平行四边形的底、高分别增加10%，那么新平行四边形的面积比原平行四边形的面积增加多少
<gadget id="calculator">1.21 - 1</gadget>
<output>0.21</output>

<gadget id="calculator">0.21 / 1</gadget>
<output>0.21</output>

<result>0.21</result>