The price of each "Story King" is 5.5 yuan, and the price of each "Fairy Tale" is 3.8 yuan. How much is each "Fairy Tale" cheaper than "Story King"
每本《故事大王》的价钱是5.5元，每本《童话故事》的价钱是3.8元．每本《童话故事》比《故事大王》便宜多少元
<gadget id="calculator">5.5 - 3.8</gadget>
<output>1.7</output>

<result>1.7</result>