"One Hundred Thousand Whys" is a set of 6 copies. If you buy it as a set, each set costs 48 yuan; if you don't buy it as a set, each copy costs 14 yuan. How to buy cost-effective? How much cheaper per instinct?
《十万个为什么》一套6本，如果成套买，每套48元；如果不成套买，每本14元．怎样买合算？每本能便宜多少钱？
<gadget id="calculator">48 / 6</gadget>
<output>8</output>

<gadget id="calculator">14 - 8</gadget>
<output>6</output>

<result>6</result>