At the end of the semester, Xiaoying's average score in Chinese, Mathematics, English, and Physical Education was 90 points. After adding natural knowledge, her average score in five subjects dropped by 2 points. What is Xiaoying's natural knowledge score?
小英期末的语文、数学、英语、体育四门功课的平均分数是90分，加上自然常识成绩后，她五门功课的平均分数下降了2分．小英自然常识成绩是多少？
<gadget id="calculator">90 - 2</gadget>
<output>88</output>

<gadget id="calculator">88 * 5</gadget>
<output>440</output>

<gadget id="calculator">90 * 4</gadget>
<output>360</output>

<gadget id="calculator">440 - 360</gadget>
<output>80</output>

<result>80</result>