A, B, and C are three people. A is 20% older than B, and B is 20% older than C. By what percentage is A older than C?
甲、乙、丙三人，甲的年龄比乙的年龄大20%，乙的年龄比丙的年龄大20%，甲比丙的年龄大百分之几？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">(6/5) * (6/5)</gadget>
<output>36/25 = around 1.44</output>

<gadget id="calculator">(36/25) - 1</gadget>
<output>11/25 = around 0.44</output>

<result>11/25 = around 0.44</result>