The new semester begins, the school needs to order 84 sets of tables and chairs, 1 table with 2 chairs. A desk is 70 yuan, and a chair is 18 yuan. How much is the total cost? (Solve with a comprehensive formula)
新学期开始了，学校需要订购84套桌椅，1张桌子配2把椅子．一张课桌70元，一把椅子18元，一共需要多少元？(用综合算式解答)
<gadget id="calculator">70 * 84</gadget>
<output>5_880</output>

<gadget id="calculator">84 * 2</gadget>
<output>168</output>

<gadget id="calculator">18 * 168</gadget>
<output>3_024</output>

<gadget id="calculator">5_880 + 3_024</gadget>
<output>8_904</output>

<result>8_904</result>