Xiaoying miscalculated 10*(□+0.2) as 10*□+0.2. How much is the difference between her calculated result and the correct answer?
小英把10*(□+0.2)错算成10*□+0.2，她计算的结果与正确答案相差多少．
<gadget id="calculator">10 * 0.2</gadget>
<output>2</output>

<gadget id="calculator">2 - 0.2</gadget>
<output>1.8</output>

<result>1.8</result>