A table costs 69 yuan and a chair costs 18 yuan. How much does it cost for a school to purchase 40 sets of such desks and chairs?
一张桌子售价69元，一把椅子售价18元．某学校准备购置40套这样的课桌椅，要花多少元？
<gadget id="calculator">69 + 18</gadget>
<output>87</output>

<gadget id="calculator">87 * 40</gadget>
<output>3_480</output>

<result>3_480</result>