After the price of a coat has decreased by 20%, it has increased by 8 yuan, and the price at this time is 80 yuan. How much is the original price of this coat?
一种上衣的价格下降20%后又增加了8元，这时的价格是80元．这种上衣的原价是多少元？
<gadget id="calculator">80 - 8</gadget>
<output>72</output>

<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">72 / (4/5)</gadget>
<output>90</output>

<result>90</result>