Students in the fourth grade participate in extracurricular interest group activities. The group participating in the calligraphy interest class accounts for (3/10) of the whole grade, the number of participating in the dance group accounts for (2/10) of the whole grade, and (1/10) of the students Join a sports interest group. What percentage of the whole grade do these three groups account for?
四年级的同学参加课外兴趣小组活动，参加书法兴趣班的小组占全年级人数的(3/10)，参加舞蹈小组的人数占全年级的(2/10)，有(1/10)的同学参加体育兴趣小组．这三个小组的人数占全年级的几分之几？
<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">2 / 10</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(3/10) + (1/5) + (1/10)</gadget>
<output>3/5 = around 0.6</output>

<result>3/5 = around 0.6</result>