A and B put together the same amount of money to wholesale back a bundle of notebooks. A took 60 more copies than B. As a result, A paid B 12 yuan. What is the unit price of each notebook?
甲、乙两人拿出同样多的钱凑起来批发回一捆本子，甲比乙多拿了60本，结果甲付给乙12元，每个本子的单价是多少元．
<gadget id="calculator">12 * 2</gadget>
<output>24</output>

<gadget id="calculator">24 / 60</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>