If the length and width of the rectangle are increased by 10%, the area will increase by how much
长方形的长和宽增加10%，面积就增加多少
<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">1 * (11/10)</gadget>
<output>11/10 = around 1.1</output>

<gadget id="calculator">2 * 1</gadget>
<output>2</output>

<gadget id="calculator">2 * (11/10)</gadget>
<output>11/5 = around 2.2</output>

<gadget id="calculator">(11/10) * (11/5)</gadget>
<output>121/50 = around 2.42</output>

<gadget id="calculator">(121/50) - 2</gadget>
<output>21/50 = around 0.42</output>

<gadget id="calculator">(21/50) / 2</gadget>
<output>21/100 = around 0.21</output>

<result>21/100 = around 0.21</result>