Suning Appliance launched the "May 1st Bargain" campaign, offering 10% off all products. Uncle Wang bought a washing machine for 1,800 yuan. How much less did he spend compared to not doing the event?
苏宁电器开展"五一大酬宾"活动，所有商品一律九折，王叔叔花1800元购买了一台洗衣机，和不搞活动比较他少花了多少元？
<gadget id="calculator">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">1_800 / (9/10)</gadget>
<output>2_000</output>

<gadget id="calculator">2_000 - 1_800</gadget>
<output>200</output>

<result>200</result>