The current price of a color TV is 3600 yuan, which is 20% cheaper than the original price. How much is the original price of this color TV?
一台彩电现价是3600元，比原价便宜20%，这台彩电原价多少元？
<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>