The school bought back 50 sets of desks and chairs, each desk was 145 yuan, and each chair was 55 yuan. How much does it cost to buy these tables and chairs?
学校买回50套办公桌椅，桌子每张145元，椅子每把55元．买这些桌椅一共需要多少元？
<gadget id="calculator">145 + 55</gadget>
<output>200</output>

<gadget id="calculator">200 * 50</gadget>
<output>10_000</output>

<result>10_000</result>