Mr. Wang bought a brand phone at a mobile phone store for 1,600 yuan, which is 20% cheaper than the original price. How much is the original price?
王老师在手机店花1600元买了一部品牌机，比原价便宜了20%，原价多少元？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1_600 / (4/5)</gadget>
<output>2_000</output>

<result>2_000</result>