A fairy tale book has 48 pages, each page has 25 lines, and each line has 20 characters. How many characters are there in this story book?
一本童话书有48页，每页25行，每行20个字，这本故事书共多少个字？
<gadget id="calculator">20 * 25 * 48</gadget>
<output>24_000</output>

<result>24_000</result>