A and B brought the same amount of money, and used all their money to buy ballpoint pens. A took 16 pens, and B took 10. After returning home, A supplies B with 10.8 yuan. What is the price of each ballpoint pen?
甲乙两人带着同样多的钱，用他们全部的钱买了圆珠笔，甲拿走了16支，乙拿走了10支．回家后甲补给乙10.8元，每支圆珠笔的价格是多少元．
<gadget id="calculator">10.8 + 10.8</gadget>
<output>21.6</output>

<gadget id="calculator">16 - 10</gadget>
<output>6</output>

<gadget id="calculator">21.6 / 6</gadget>
<output>3.6</output>

<result>3.6</result>