There are 80 books on the upper shelf of book 2, and 12 more books on the lower shelf than the upper shelf. How many more books are there on the lower shelf than on the upper shelf?
书2架上层有80本书，下层比上层的4倍还多12本，这书架下层比上层多几本书？
<gadget id="calculator">80 * 4</gadget>
<output>320</output>

<gadget id="calculator">320 + 12</gadget>
<output>332</output>

<gadget id="calculator">332 - 80</gadget>
<output>252</output>

<result>252</result>