Each desk is 45 yuan, and each chair is 25 yuan. The school needs to buy 80 sets of desks and chairs. How much does it cost in total?
课桌每张45元，椅子每把25元，学校要买80套课桌椅，一共要付多少元？
<gadget id="calculator">45 + 25</gadget>
<output>70</output>

<gadget id="calculator">70 * 80</gadget>
<output>5_600</output>

<result>5_600</result>