A pen is 9 yuan, and the price of a book of "Fairy Tales" is four times that. How much is the book of "Fairy Tales"?
一支钢笔9元，一本《童话故事》书的价钱是它的4倍，这本《童话故事》书多少钱？
<gadget id="calculator">9 * 4</gadget>
<output>36</output>

<result>36</result>