The school purchased 85 sets of tables and chairs. 57 yuan per table, 23 yuan per chair. How much did the school purchase these desks and chairs?
学校购进85套桌椅．每张桌子57元，每把椅子23元．学校购买这些桌椅一共多少元？
<gadget id="calculator">57 + 23</gadget>
<output>80</output>

<gadget id="calculator">80 * 85</gadget>
<output>6_800</output>

<result>6_800</result>