A, B, and C each pay the same amount of money to buy back a batch of exercise books together. When assigning, A wants 16 more exercise books than B, and B wants 2 less exercise books than C. A returns 2.40 yuan to C, how much more will be refunded to B.
甲、乙、丙三人各出同样多的钱一起买回一批练习本．分配时，甲要的练习本比乙多16本，乙要的练习本比丙少2本．甲退还给丙2.40元，还要退还给乙多少元．
<gadget id="calculator">2.4 / 4</gadget>
<output>0.6</output>

<gadget id="calculator">0.6 * 6</gadget>
<output>3.6</output>

<result>3.6</result>