Zhang Ling bought 8 copies of "Children's Literature" and 12 copies of "The King of Stories", for a total of 79.2 yuan. Each "Story King" is 4.5 yuan, how much is each "Children's Literature"?
张玲买了8本《儿童文学》、12本《故事大王》，共用去79.2元．每本《故事大王》4.5元，每本《儿童文学》多少元？
<gadget id="calculator">4.5 * 12</gadget>
<output>54</output>

<gadget id="calculator">79.2 - 54</gadget>
<output>25.2</output>

<gadget id="calculator">25.2 / 8</gadget>
<output>3.15</output>

<result>3.15</result>