The school bought 24 packs of exercise books, each pack of 80 books, and each book costs 0.35 yuan. How much did you spend on these exercise books?
学校买来24包练习本，每包80本，每本0.35元，买这些练习本共花多少元？
<gadget id="calculator">0.35 * 80 * 24</gadget>
<output>672</output>

<result>672</result>