If the number of students before and after training increases from 1 to 8, what is the growth rate?
培训前后的学生人数从1人增加到了8人，则增长率为多少．
<gadget id="calculator">8 - 1</gadget>
<output>7</output>

<gadget id="calculator">7 / 1</gadget>
<output>7</output>

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

<gadget id="calculator">7 * 1</gadget>
<output>7</output>

<result>7</result>