If the perimeter of a square increases by 10%, how much does the area of the square increase
一个正方形的周长增加10%，这个正方形的面积就增加多少
<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">(11/10) ** 2</gadget>
<output>121/100 = around 1.21</output>

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

<gadget id="calculator">(121/100) - 1</gadget>
<output>21/100 = around 0.21</output>

<gadget id="calculator">(21/100) / 1</gadget>
<output>21/100 = around 0.21</output>

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