A popular science book has 300 pages, 24 lines per page, and 30 characters per line. After re-typesetting, it is changed to 30 lines per page and 36 characters per line. How many pages does this book have now?
一本科普书有300页，每页24行，每行30个字．重新排版后，改为每页30行，每行36个字，现在这本书有多少页．
<gadget id="calculator">30 * 24</gadget>
<output>720</output>

<gadget id="calculator">300 * 720</gadget>
<output>216_000</output>

<gadget id="calculator">36 * 30</gadget>
<output>1_080</output>

<gadget id="calculator">216_000 / 1_080</gadget>
<output>200</output>

<result>200</result>