A desk is 60 yuan, and a chair is 45 yuan. The experimental primary school needs to buy 80 sets of desks and chairs for students. How much does it cost in total?
一张课桌60元，一把椅子45元，实验小学要购买80套学生课桌椅，一共需要多少钱？
<gadget id="calculator">60 + 45</gadget>
<output>105</output>

<gadget id="calculator">105 * 8</gadget>
<output>840</output>

<result>840</result>