There are 45 people in class 51 who came to school this morning, and 5 of them asked for leave due to business and did not come to school to study. What is the attendance rate of the class in the morning?
五1班今天早上到校45人，5人因事请假没有到校学习，上午班级出勤率是多少．
<gadget id="calculator">45 + 5</gadget>
<output>50</output>

<gadget id="calculator">45 / 50</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">100 / 100</gadget>
<output>1</output>

<gadget id="calculator">(9/10) * 1</gadget>
<output>9/10 = around 0.9</output>

<result>9/10 = around 0.9</result>