Li Li and Wang Gang took the same amount of money to the supermarket to buy exercise books. They used all the money to buy 12 exercise books, each at 1.8 yuan. After buying, Li Li took 8 copies, and Wang Gang took 4 copies. According to this division, how much should Li Li give Wang Gang?
李丽和王刚带同样多的钱去超市买练习本，他们用所有的钱买了12个练习本，每本1.8元．买完后李丽拿走8本，王刚拿走4本，按这种分法，李丽还应再给王刚多少钱？
<gadget id="calculator">1.8 * 8</gadget>
<output>14.4</output>

<gadget id="calculator">12 / 2</gadget>
<output>6</output>

<gadget id="calculator">1.8 * 6</gadget>
<output>10.8</output>

<gadget id="calculator">14.4 - 10.8</gadget>
<output>3.6</output>

<result>3.6</result>