There are 150 fifth grade students in a certain elementary school, among them there are 120 students with normal eyesight, what is the myopia rate of the fifth grade students?
某小学有五年级学生150人，其中视力正常的同学有120人，五年级同学的近视率是多少．
<gadget id="calculator">150 - 120</gadget>
<output>30</output>

<gadget id="calculator">30 / 150</gadget>
<output>1/5 = around 0.2</output>

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

<gadget id="calculator">(1/5) * 1</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>