Central Primary School newly bought 45 sets of single-person desks and chairs, each desk is 120 yuan, and each chair is 80 yuan. How much did it cost in total? (two ways to answer)
中心小学新买来45套单人课桌椅，每张课桌120元，每把椅子80元．一共用去多少元？(两种方法解答)
<gadget id="calculator">120 * 45</gadget>
<output>5_400</output>

<gadget id="calculator">80 * 45</gadget>
<output>3_600</output>

<gadget id="calculator">5_400 + 3_600</gadget>
<output>9_000</output>

<result>9_000</result>