If the side length of a square increases by 10%, how much does the area of the square increase?
一个正方形的边长增加10%，这个正方形的面积增加多少．
<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) * (11/10)</gadget>
<output>121/100 = around 1.21</output>

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

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

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