Each chair is 34 yuan, and each desk is 66 yuan. How much will it cost the school to buy 30 sets of such desks?
每把椅子34元，每张桌子66元，学校买回30套这样的课桌，一共要用多少元？
<gadget id="calculator">34 + 66</gadget>
<output>100</output>

<gadget id="calculator">100 * 30</gadget>
<output>3_000</output>

<result>3_000</result>