The school bought 50 desks at 85 yuan each, and 50 chairs at 45 yuan each. How much more are the desks than the chairs?
学校买来50张课桌，每张85元，还买来50把椅子，每把45元，课桌比椅子多用多少钱？
<gadget id="calculator">85 - 45</gadget>
<output>40</output>

<gadget id="calculator">40 * 50</gadget>
<output>2_000</output>

<result>2_000</result>