If the length of a rectangle is increased by 10% and the width is shortened by 10%, what percentage of the area of the current rectangle is the area of the original rectangle?
一个长方形的长增加10%，宽缩短10%，那么现在的长方形面积是原来长方形面积的百分之几？
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 + (1/10)</gadget>
<output>11/10 = around 1.1</output>

<gadget id="calculator">20 * (11/10)</gadget>
<output>22</output>

<gadget id="calculator">1 - (1/10)</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">10 * (9/10)</gadget>
<output>9</output>

<gadget id="calculator">22 * 9</gadget>
<output>198</output>

<gadget id="calculator">20 * 10</gadget>
<output>200</output>

<gadget id="calculator">198 / 200</gadget>
<output>99/100 = around 0.99</output>

<result>99/100 = around 0.99</result>