During the May Day Golden Week, Suning Home Appliances sold a washing machine with a 20% discount for 1,800 yuan; how much cheaper is the current price than the original price?
五一黄金周，苏宁家电八折出售一台洗衣机，售价1800元；现价比原价便宜多少元？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1_800 / (4/5)</gadget>
<output>2_250</output>

<gadget id="calculator">2_250 - 1_800</gadget>
<output>450</output>

<result>450</result>