The shopping mall celebrated with a 20% discount on all products. Dad used 3,600 yuan to buy a computer. What is the original price of this computer?
商场店庆，所有商品八折出售，爸爸用3600元买回一台电脑，这台电脑原价多少元．
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">3_600 / (4/5)</gadget>
<output>4_500</output>

<result>4_500</result>