There are 800 students in Xingxing Primary School, 15% of them did not participate in the interest activity group, how many people did not participate in the interest activity group?
星星小学有800名学生，其中有15%没有参加兴趣活动小组，没有参加兴趣活动小组的有多少人？
<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">800 * (3/20)</gadget>
<output>120</output>

<result>120</result>