To celebrate Children's Day on June 1st, the school bought 200 pens and 100 pencil cases to reward the safflower teenagers, spending a total of 2660 yuan. It is known that each pen is 9 yuan, how much is each stationery box?
为庆祝"六•一"儿童节，学校买来200支钢笔和100个文具盒奖励红花少年，一共花去2660元．已知每支钢笔9元，每个文具盒多少元？
<gadget id="calculator">200 * 9</gadget>
<output>1_800</output>

<gadget id="calculator">2_660 - 1_800</gadget>
<output>860</output>

<gadget id="calculator">860 / 100</gadget>
<output>43/5 = around 8.6</output>

<result>43/5 = around 8.6</result>