The current price of a brand TV is 3,600 yuan, which is 20% lower than the original price. How much is the original price?
一种品牌电视机现价3600元，比原价降低了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">3_600 / (4/5)</gadget>
<output>4_500</output>

<result>4_500</result>