The school bought 90 sets of desks and chairs, each desk is 85 yuan, and each chair is 45 yuan. How much does it cost to buy these desks and chairs?
学校买来90套课桌椅，每张桌子85元，每把椅子45元，买这些课桌椅共需多少元？
<gadget id="calculator">85 * 90</gadget>
<output>7_650</output>

<gadget id="calculator">45 * 90</gadget>
<output>4_050</output>

<gadget id="calculator">7_650 + 4_050</gadget>
<output>11_700</output>

<result>11_700</result>