After Xiao Ming bought 5 ballpoint pens and 12 exercise books with 20 yuan, if the remaining money is 4 cents less to buy a ballpoint pen, and 6 cents less to buy an exercise book, what is the price of an exercise book ．
小明用20元钱买了5支圆珠笔和12本练习本后，剩下的钱若买一支圆珠笔少4角，若买一本练习本少6角，则一本练习本的价钱是多少元．
<gadget id="calculator">0.6 - 0.4</gadget>
<output>0.2</output>

<gadget id="calculator">0.2 * 5</gadget>
<output>1</output>

<gadget id="calculator">1 + 0.2 + 20 + 0.4</gadget>
<output>21.6</output>

<gadget id="calculator">5 + 1 + 12</gadget>
<output>18</output>

<gadget id="calculator">21.6 / 18</gadget>
<output>1.2</output>

<result>1.2</result>