There are a total of 80 students in the two classes of the fourth grade. All the new single desks and chairs have been replaced for the fourth grade. Each desk is 67 yuan, and each chair is 33 yuan. How much did it cost to replace these desks and chairs?
四年级两个班一共有80名学生，学习为四年级全部更换了新的单人课桌和椅子，每张桌子67元，每把椅子33元，更换这些桌椅一共用了多少钱？
<gadget id="calculator">67 + 33</gadget>
<output>100</output>

<gadget id="calculator">100 * 80</gadget>
<output>8_000</output>

<result>8_000</result>