A and B pay the same amount of money, and ask others to buy exercise books. After buying them back, A asks for 14 copies, B asks for 8 copies, and A gives B 0.84 yuan. How much is each exercise book bought?
甲乙两人出同样多的钱，请别人买练习本，买回后，甲要了14本，乙要了8本，甲又给了乙0.84元，问所买练习本每本多少钱？
<gadget id="calculator">14 + 8</gadget>
<output>22</output>

<gadget id="calculator">22 / 2</gadget>
<output>11</output>

<gadget id="calculator">14 - 11</gadget>
<output>3</output>

<gadget id="calculator">0.84 / 3</gadget>
<output>0.28</output>

<result>0.28</result>