Five judges give a score to a singer. The average score is 89.45 points if the highest score is removed, and the average score is 90 points if the lowest score is removed. How much higher is the highest score than the lowest score?
5名评委给一位歌唱演员打分，去掉一个最高分平均分是89.45分，去掉一个最低分平均得分90分，最高分比最低分高多少？
<gadget id="calculator">90 - 89.45</gadget>
<output>0.55</output>

<gadget id="calculator">4 * 0.55</gadget>
<output>2.2</output>

<result>2.2</result>