Xiaoyu bought 6 exercise books and spent 2.0□ yuan, but the numbers at the end were unclear. Please do the math for Xiaoyu, how much is each exercise book?
小宇买了6个练习本，花了2.0□元，末尾的数字看不清了．请你帮小宇算一算，每个练习本是多少钱？
<gadget id="calculator">2 + 0 + 4</gadget>
<output>6</output>

<gadget id="calculator">2.04 / 6</gadget>
<output>0.34</output>

<result>0.34</result>